Dissertations / Theses on the topic 'Optical parametric amplification'
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1
Fragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4." Doctoral thesis, KTH, Laserfysik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
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This thesis explores the use of engineered nonlinear crystals from the KTiOPO4 (KTP) family as the gain material in optical parametric amplifiers (OPAs), with the aim to achieve more knowledge about the benefits and limitations of these devices. The work aims further at extending the possible applications of OPAs by constructing and investigating several efficient and well performing amplifiers. An OPA consists of a strong pump source, which transfers its energy to a weak seed beam while propagating through a nonlinear crystal. The crystals employed in this work are members of the KTP family, which are attractive due to their large nonlinear coefficients, high resistance to damage and wide transparency range. The flexibility of OPAs with respect to different wavelength regions and pulse regimes was examined by employing various dissimilar seed and pump sources. The possibility to adapt an OPA to a specific pump and seed wavelength and achieve efficient energy conversion between the beams, originates from quasi-phasematching, which is achieved in periodically poled (PP) nonlinear crystals. Quasi-phasematched samples can be obtained by changing the position of certain atoms in a ferroelectric crystal and thereby reversing the spontaneous polarisation. In this thesis several material properties of PP crystals from the KTP family were examined. The wavelength and temperature dispersion of the refractive index were determined for PP RbTiOPO4, which is essential for future use of this material. Another experiment helped to increase the insight into the volumes close to domain walls in PP crystals Further, several OPAs were built and their ability to efficiently amplify the seed beam without changing its spectral or spatial properties was studied. Small signal gains of up to 55 dB and conversion efficiencies of more than 35 % were achieved for single pass arrangements employing 8 mm long PPKTP crystals. Apart from constructing three setups, which generated powerful nanosecond, picosecond and femtosecond pulses, the possibility to amplify broadband signals was investigated. An increase of the OPA bandwidth by a factor of approximately three was achieved in a noncollinear configuration.QC 20101013
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Fragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4." Doctoral thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
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This thesis explores the use of engineered nonlinear crystals from the KTiOPO4 (KTP) family as the gain material in optical parametric amplifiers (OPAs), with the aim to achieve more knowledge about the benefits and limitations of these devices. The work aims further at extending the possible applications of OPAs by constructing and investigating several efficient and well performing amplifiers.
An OPA consists of a strong pump source, which transfers its energy to a weak seed beam while propagating through a nonlinear crystal. The crystals employed in this work are members of the KTP family, which are attractive due to their large nonlinear coefficients, high resistance to damage and wide transparency range. The flexibility of OPAs with respect to different wavelength regions and pulse regimes was examined by employing various dissimilar seed and pump sources.
The possibility to adapt an OPA to a specific pump and seed wavelength and achieve efficient energy conversion between the beams, originates from quasi-phasematching, which is achieved in periodically poled (PP) nonlinear crystals. Quasi-phasematched samples can be obtained by changing the position of certain atoms in a ferroelectric crystal and thereby reversing the spontaneous polarisation.
In this thesis several material properties of PP crystals from the KTP family were examined. The wavelength and temperature dispersion of the refractive index were determined for PP RbTiOPO4, which is essential for future use of this material. Another experiment helped to increase the insight into the volumes close to domain walls in PP crystals
Further, several OPAs were built and their ability to efficiently amplify the seed beam without changing its spectral or spatial properties was studied. Small signal gains of up to 55 dB and conversion efficiencies of more than 35 % were achieved for single pass arrangements employing 8 mm long PPKTP crystals. Apart from constructing three setups, which generated powerful nanosecond, picosecond and femtosecond pulses, the possibility to amplify broadband signals was investigated. An increase of the OPA bandwidth by a factor of approximately three was achieved in a noncollinear configuration.
3
Lai, Ming-fai, and 黎明輝. "All-optical signal processing based on optical parametric amplification." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41508877.
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Lai, Ming-fai. "All-optical signal processing based on optical parametric amplification." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41508877.
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Vaughan, Peter Matthias. "Optical-parametric-amplification applications to complex images." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41134.
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We have used ultrafast optics, primarily focused on the nonlinear processes of Polarization Gating and of Optical Parametric Amplification, one for measurement and the other for imaging purposes. For measurement, we have demonstrated a robust method of measurement to simultaneously measure both optical pulses used in a pump-probe type configuration. We refer to this method of pulse measurement as Double Blind Polarization Gating FROG. We have demonstrated this single-shot method for measuring two unknown pulses using one device. In addition to pulse measurement, we have demonstrated the processes of Optical Parametric Amplification (OPA) applicability to imaging of complex objects. We have done this where the Fourier transform plane is used during the interaction. We have amplified and wavelength converted a complex image. We observe a gain of ~100, and, although our images were averaged over many shots, we used a single-shot geometry, capable of true single-shot OPA imaging. To our knowledge, this is the first Fourier-plane OPA imaging of more than a single spatial-frequency component of an image. We observe more than 30 distinct spatial frequency components in both our amplified image and our wavelength shifted image. We have demonstrated all-optical spatial filtering for these complex images. We have demonstrated that direct Fourier filtering of spatial features is possible by using a shaped pump beam. We can isolate certain portions of the image simply by rotating the crystal.
6
Hussain, N. A. "The quantum theory of optical parametric amplification." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302847.
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Siddiqui, Aleem 1977. "Few-cycle and cavity-enhanced optical parametric amplification." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79494.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 179-185).
Optical parametric amplifiers have emerged as important optical sources by extending the properties of few-cycle laser sources, which exist only in materials with sufficiently large gain bandwidths, to wide array of spectral ranges. The work reported in this thesis relates to two areas for the continued development of optical parametric amplification based sources. First, we present a white light seeded, carrier-envelope stable, degenerately pumped OPA producing near tranform-limited sub 7 fs , 3 [mu]J pulses at the driver wavelength from a long pulse, non-CEP stable Ti:sapphire regenerative amplifier. Problems to the spectral phase jump at the driver wavelength, 800 nm, were avoided by using a near infrared OPA to produce white light continuum down to 800 nm where the spectral phase is smooth. Secondly, enhancement cavities are used in conjunction with parametric amplifiers resulting in a new technique entitled, cavity-enhanced optical parametric chirped-pulse amplification (C-OPCPA). C-OPCPA increases the capabilities of nonlinear crystals and can allow continued scaling of parametric amplifier systems to high repetition rate. This work contains the first theoretical and experimental investigation of C-OPCPA. Numerically, passive pump pulse shaping of the intracavity pump power is shown to enable octave spanning gain. Experimentally, a first proof-of-principle experiment demonstrates a 78 MHz C-OPCPA with more than 50% conversion with under 1 W of incident pump power. A comparison to a single pass system shows improvements in the C-OPCPA of orders of magnitude in conversion efficiency and 3 fold increase in phase matching bandwidth in 10 and 20 mm periodically poled lithium niobate phase matched for parametric amplification with 1030 nm pump wavelength and a 1550 nm signal wavelength. A Yb-fiber laser based CPA system producing up to 5 W of 500 fs pulses comprises the pump source, and a Er-fiber laser the signal.
by Aleem Mohammad Siddiqui.
Ph.D.
8
DeShano, Bradley R. "Optical Parametric Amplification in Orientation-Patterned GaAs Waveguides." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1462225174.
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Antipenkov, Roman. "High energy broad bandwidth optical parametric chirped pulse amplification." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110307_144951-01814.
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Rapidly developing areas of high field physics, generation of high order harmonics or isolated attosecond pulses, require high peak power few-cycle pulse sources. Optical parametric chirped pulse amplification (OPCPA) has shown potential to satisfy these requirements and at present OPCPA is the leading technology for high energy few-cycle pulse table-top systems.
The main objectives of this thesis were to investigate optical parametric amplification of broadband seed pulses in femtosecond and picosecond regimes, to develop and optimize a compact TW-scale OPCPA system intended for various applications in areas of high-field physics. In this thesis the main concept of such system is discussed, advantages and disadvantages of proposed approach are analyzed, the setup is compared to other world known systems.
In this thesis an original approach for power scaling of regenerative amplifier by implementing several active elements in prolonged resonator has been proposed and investigated. Femtosecond pulse amplification in dual active element Yb:KGW regenerative amplifier has been demonstrated, resulting in boost of average output power to 30 W.
Broad bandwidth pulse generation, parametric amplification and compression to transform limited values were analyzed both numerically and experimentally. White light continuum generation in bulk material for broadband seed formation, its further optical parametric amplification in noncollinear scheme were investigated and Yb:KGW driven... [to full text]Stiprių laukų fizikos srities tyrimams, aukštų eilių harmonikų ir pavienių atosekundinių impulsų generavimui, yra reikalingos kompaktiškos teravatų smailinės galios kelių optinių ciklų išvadinių impulsų lazerinės sistemos. Optinis parametrinis „čirpuotų“ impulsų stiprinimas yra vienas pagrindinių metodų leidžiančiu pasiekti šiems taikymams reikalingus lazerinių sistemų parametrus. Šios disertacijos darbo tikslas – ištirti femtosekundinės ir pikosekundinės trukmės impulsų stiprinimą optiniuose parametriniuose stiprintuvuose užkratui naudojant ypač plataus spektro signalą, bei sukurti ir optimizuoti čirpuotų impulsų parametrinio stiprinimo sistemą, užtikrinančią patikimą teravatų smailinės galios impulsų formavimą. Disertacijoje aptariama bendra tokios sistemos architektūra, nagrinėjami privalumai ir trūkumai, palyginama su kitomis pasaulyje egzistuojančiomis sistemomis. Šiame darbe pasiūlytas ir ištirtas lazerių vidutinės išvadinės galios didinimo metodas, naudojant kelis aktyviuosius elementus viename rezonatoriuje, ir pademonstruotas femtosekundinių impulsų stiprinimas šio metodo pagrindu sukonstruotame dviejų Yb:KGW aktyvių elementų regeneratyviniame stiprintuve, tokiu būdu padidinant lazerio išvadinę galią iki 30 W. Darbo metu sukonstruota bei ištirta Yb:KGW femtosekundiniu lazeriu kaupinamos baltos šviesos kontinuumo generavimo ir nekolinearaus kaupinimo optinio parametrinio stiprinimo sistema, kurios išvadinių impulsų energiją siekia 20 mikrodžiaulių, o impulsai... [toliau žr. visą tekstą]
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Xu, Xing, and 徐兴. "Towards green optical fiber amplification: distributed parametric amplifier and its applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49617564.
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With the data explosion brought about by smartphones and tables during the past few years, how to keep these ever-increasing data in a stable, fast and green transmission and exchange environment is among the top problems for researchers in the communication field. As the backbone for the modern communication network, optical fiber communication is currently playing a key role in this on-going technology revolution. The optical amplifier is one of the most powerful tools of the optical communication system to cope with the data explosion. Distributed parametric amplification (DPA), with its potential green characteristics, i.e. noiseless, high-speed response, high power efficiency and wavelength flexibility, provides a promising amplification solution for the next generation of optical communication systems. As on specific type of optical parametric amplification (OPA), DPA is based on the combination of self-phase modulation (SPM), cross-phase modulation (XPM) and four-wave mixing (FWM) effects. DPA’s main difference from OPA lies in the amplification medium. As DPA utilizes the most commonly adopted transmission fiber, i.e. single-mode fiber (SMF) and dispersion-shifted fiber (DSF), the signal transmission can thus be fulfilled simultaneously with the parametric amplification in the same optical fiber: DPA’s configuration also brings another green feature, pump-power recycling, which further enhances the power efficiency of the communication system.
As the fundamental study on DPA, first the gain spectrum is investigated. Both single- and two-pump DPAs are presented experimentally for WDM signals. In these experiments, residual pump power recycling is enabled by a concentrated photovoltaic (CPV) cells, Moreover, through experimental comparison with another important distributed amplification technology, distributed Raman amplification (DRA), DPA’s advantages over DRA are demonstrated. When considering similar performance levels, DPA needs much lower pump power than DRA, which in return improves the system power efficiency.
The performance of DPA cannot be judged unless it is assessed in more advanced application scenarios. Thus more advanced studies on DPA are conducted. The modulation format transparency is first presented with both phase (differential phase-shift keying (DPSK)) and intensity (on-off keying (OOK)) modulation formats, and our experimental results show the superiority of DPSK over traditional OOK. Furthermore, from the perspective of wavelength flexibility, we have demonstrated, for the first time to the best of our knowledge, a DPA system at the 1.3μm telecommunication window, which provides a potentially green amplification scheme at this transmission band. All these experiments, to a certain extent, certify the feasibility of DPA to become a green optical fiber amplifier. Finally, to demonstrate DPA’s compatibility within a more complicated communication system, we propose a power–efficient UWB/DPA system for the “last mile”. After experiments on photonic UWB pulse generation and the supporting DPA system, the hybrid UWB/DPA system is demonstrated with preliminary simulation results.
My research efforts presented in this thesis all aim at the practical application of the DPA scheme into the next-generation of green communication systems. If further armed with the phase-sensitive configuration, DPA’s potential as a green amplifier will be further augmented.published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
11
Bates, Philip Kevin. "Optical parametric chirped pulse amplification in the few-cycle regime." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445345.
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Jazayerifar, Mahmoud, Meysam Namdari, Ryan Hamerly, Dodd Gray, Christopher Rogers, and Kambiz Jamshidi. "Feasibility study of optical parametric amplification using CMOS compatible ring resonators." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A35122.
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In this paper, we analytically describe the parametric amplification in ring resonators using silicon and silicon nitride waveguides. Achievable gain and bandwidth of the ring-based amplifiers are studied taking into account the Kerr nonlinearity for silicon nitride and Kerr nonlinearity as well as two photon absorption and free carrier absorption for silicon waveguides. Both telecom and 2-μm wavelengths are investigated in case of silicon. An approach for obtaining the optimum amplifier design without initiating the comb generation has been introduced. It is shown that there is a trade-off between the input pump and amplifier bandwidth. It is estimated that using optimum designs an amplifier with a gain and bandwidth of 10 dB and 10 GHz could be feasible with silicon ring resonators in 2 μm.
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Croussore, Kevin. "ALL-OPTICAL REGENERATION FOR PHASE-SHIFT KEYED OPTICAL COMMUNICATION SYSTEMS." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2481.
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All-optical signal processing techniques for phase-shift keyed (PSK) systems were developed theoretically and demonstrated experimentally. Nonlinear optical effects in fibers, in particular four-wave mixing (FWM) that occurs via the ultra-fast Kerr nonlinearity, offer a flexible framework within which numerous signal processing functions can be accomplished. This research has focused on the regenerative capabilities of various FWM configurations in the context of processing PSK signals. Phase-preserving amplitude regeneration, phase regeneration, and phase-regenerative wavelength conversion are analyzed and demonstrated experimentally. The single-pump phase-conjugation process was used to regenerate RZ-DPSK pulse amplitudes with different input noise distributions, and the impact on output phase characteristics was studied. Experiments revealed a limited range over which amplitude noise could effectively be suppressed without introduction of phase noise, particularly for signals with intensity pattern effects. Phase regeneration requires use of phase-sensitive amplification (PSA), which occurs in nonlinear interferometers when the pump and signal frequencies are degenerate (NI-PSA), or in fiber directly through single-stage (degenerate) or cascaded (non-degenerate) FWM processes. A PSA based on a Sagnac interferometer provided the first experimental demonstration of DPSK phase and amplitude regeneration. The phase-regenerative capabilities of the NI-PSA are limited in practice by intrinsic noise conversion (amplitude to phase noise) and to a lesser extent by the requirement to modulate the pump wave to suppress stimulated Brillouin scattering (SBS). These limitations are relaxed in novel materials with higher SBS thresholds and nonlinearities. Degenerate FWM provides PSA in a traveling-wave configuration that intrinsically suppresses the noise conversion affecting the NI-PSA, while providing stronger phase-matched gain. Experiments confirmed superior phase-regenerative behavior to the NI-PSA with simultaneous reduction of amplitude noise for NRZ-DPSK signals. Phase-regenerative wavelength conversion (PR-WC) provides the regenerative properties of PSA at a new wavelength, and was proposed and demonstrated for the first time in this research. The parallel implementation of two FWM processes, phase-conjugation and frequency conversion, provides two idlers which exhibit interesting and useful regenerative properties. These were investigated theoretically and experimentally. Ideal phase-regenerative behavior is predicted when the contributing FWM processes are equally phase-matched, which can be maintained over any interaction length or wavelength shift provided the pump powers are properly adjusted. Depleted-pump regime PR-WC provides simultaneous phase and amplitude regeneration. Experiments confirmed regenerative behavior for wavelength shifts of the idlers up to 5 nm. Two techniques for phase regeneration of 4-level PSK signals were developed and evaluated. The first is based on parallel operation of PSAs suitable for processing 2-level PSK signals, where phase projection and regeneration are combined to recover the input data. Analysis of this scheme outlined the conditions required for effective phase regeneration and for practical implementation using known PSAs. A novel process based on FWM (parallel phase-conjugation followed by PSA) was developed and analyzed, and demonstrated using numerical simulations. These studies provide a basis for further work in this area.Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD
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Ališauskas, Skirmantas. "Infrared Few-Cycle Pulse Optical Parametric Amplifier." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101001_145118-06284.
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Main objective of this thesis is to generate and amplify few cycle pulses in the infrared region. In this thesis, two approaches were introduced for few cycle pulse parametric amplification at 800 nm and 1.5 μm. First approach is dedicated for prospects for increasing average power of OPCPA via multi-beam pumping; the second approach is dedicated for generation of carrier-envelope-phase (CEP) stable high energy (up to tens of millijoules) few-cycle pulses at 1.5 μm.
An experimental investigation of two or three beams-pumped OPCPA system based on type I BBO crystal is presented. The 2nd OPA stage was pumped by two or three pump beams derived from independent Nd:YAG laser amplifiers. The efficiency of interaction was shown to be comparable to that of single-beam pumped OPA and diminishes only slightly due to cascaded parametric diffraction of interacting waves. The effect was observed and its impact on efficiency of parametric amplification process was shown to decrease at larger intersecting angles of pump. In the prospect, the use of multiple lasers for OPA pumping has an appeal for increasing the repetition rate and consequently the average power of an ultrashort pulse laser system. Finally, the concept and realization of hybrid system based on type II KTP OPCPA and filamentation are described. A CEP-stable 1.5 μm OPCPA system with pulse energies up to 12.5 mJ after 4 OPA stages is demonstrated. Furthermore, self-compression of CEP-stable 2.2 mJ, 74.4 fs, 1.57 μm input... [to full text]Disertacijos darbo tikslas – suformuoti ir parametriškai stiprinti kelių optinių ciklų trukmės impulsus infraraudonojoje srityje Šioje disertacijoje buvo tirtos dvi moduliuotosios fazės („čirpuotų“) impulsų parametrinio stiprinimo sistemos, stiprinančios ypač plataus spektro impulsus 800 nm bei 1,5 μm srityse. Pirmoji sistema skirta tirti galimybę didinti lazerinės spinduliuotės vidutinę galią keliais pluoštais kaupinamame parametriniame stiprintuve; antroji sistema skirta kelių optinių ciklų trukmės stabilios fazės impulsų formavimui 1,5 μm srityje. Disertacijoje aprašomas I tipo parametrinis stiprintuvas, kurio 2-oji pakopa buvo kaupinama dviem arba trimis nepriklausomų lazerinių šaltinių pluoštais. Nustatyta, kad parametrinį stiprintuvą kaupinant keliais pluoštais stebimas naujų erdvinių komponentų atsiradimas, kuriuos sąlygoja parametrinė pakopinė difrakcija, o tai mažina bendrą sistemos energetinio keitimo efektyvumą.. Darbo metu pademonstruota galimybė mažinti parametrinės difrakcijos sąlygotus nuostolius parametriniame stiprintuve derinant kampus tarp kaupinimo pluoštų. Taip pat pristatomas alternatyvus būdas formuoti didelės energijos (kelių dešimčių milidžaulių) kelių optinių ciklų trukmės stabilios fazės impulsus 1,5 μm srityje. Būdas paremtas sąlyginai siauro spektro 1,5 μm srityje stiprinimu II tipo KTP kristale bei spektro plėtra inertinėse dujose po stiprinimo. 4 pakopų parametriniame stiprintuve pasiekta iki šiol didžiausia 12,5 mJ impulso energija 1,5 μm... [toliau žr. visą tekstą]
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Lam, Ping Koy, and Ping Lam@anu edu au. "Applications of Quantum Electro-Optic Control and Squeezed Light." The Australian National University. Faculty of Science, 1999. http://thesis.anu.edu.au./public/adt-ANU20030611.170800.
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In this thesis, we report the observations of optical squeezing from second harmonic generation (SHG), optical parametric oscillation (OPO) and optical parametric amplification (OPA). Demonstrations and proposals of applications involving the squeezed light and electro-optic control loops are presented.
¶
In our SHG setup, we report the observation of 2.1 dB of intensity squeezing on the second harmonic (SH) output. Investigations into the system show that the squeezing performance of a SHG system is critically affected by the pump noise and a modular theory of noise propagation is developed to describe and quantify this effect. Our experimental data has also shown that in a low-loss SHG system, intra-cavity nondegenerate OPO modes can simultaneously occur. This competition of nonlinear processes leads to the optical clamping of the SH output power and in general can degrade the SH squeezing. We model this competition and show that it imposes a limit to the observable SH squeezing. Proposals for minimizing the effect of competition are presented.
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In our OPO setup, we report the observation of 7.1 dB of vacuum squeezing and more than 4 dB of intensity squeezing when the OPO is operating as a parametric amplifier. We present the design criteria and discuss the limits to the observable squeezing from the OPO.We attribute the large amount of squeezing obtained in our experiment to the high escape efficiency of the OPO. The effect of phase jitter on the squeezing of the vacuum state is modeled.
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The quantum noise performance of an electro-optic feedforward control loop is investigated. With classical coherent inputs, we demonstrate that vacuum fluctuations introduced at the beam splitter of the control loop can be completely cancelled by an optimum amount of positive feedforward. The cancellation of vacuum fluctuations leads to the possibility of noiseless signal amplification with the feedforward loop. Comparison shows that the feedforward amplifier is superior or at least comparable in performance with other noiseless amplification schemes. When combined with an injection-locked non-planar ring Nd:YAG laser, we demonstrate that signal and power amplifications can both be noiseless and independently variable.
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Using squeezed inputs to the feedforward control loop, we demonstrate that information carrying squeezed states can be made robust to large downstream transmission losses via a noiseless signal amplification. We show that the combination of a squeezed vacuum meter input and a feedforward loop is a quantum nondemolition (QND) device, with the feedforward loop providing an additional improvement on the transfer of signal. In general, the use of a squeezed vacuum meter input and an electro-optic feedforward loop can provide pre- and post- enhancements to many existing QND schemes.
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Finally, we proposed that the quantum teleportation of a continuous-wave optical state can be achieved using a pair of phase and amplitude electro-optic feedforward loops with two orthogonal quadrature squeezed inputs. The signal transfer and quantum correlation of the teleported optical state are analysed. We show that a two dimensional diagram, similar to the QND figures of merits, can be used to quantify the performance of a teleporter.
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Voratovic, Dayen Chad. "Generation and Detection of Coherent Pulse Trains in Periodically Poled Lithium Niobate Through Optical Parametric Amplification." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324406162.
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Capelle, Thibault. "Electromechanical cooling and parametric amplification of an ultrahigh-Q mechanical oscillator." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUS045.
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Dans cette thèse, nous avons étudié un système mécanique de très haut facteur de qualité couplé à une cavité micro-onde supraconductrice. Nous présenterons une technique originale de caractérisation des pertes des cavités micro-ondes planaires, ainsi qu’une technique de refroidissement par bande latérale résolue utilisée pour refroidir activement cet oscillateur mécanique à l’aide de la cavité micro-onde. Enfin, nous présenterons des optimisations de cette expérience qui ouvrent la voie au refroidissement de l'oscillateur mécanique dans son état quantique fondamental. Un tel système hybride pourrait jouer le rôle de mémoire quantique sur puce, permettant de stocker les états quantiques non-gaussiens générés par des circuits quantiques supraconducteurs dans des vibrations mécaniques avec des temps de cohérence approchant la secondeIn this thesis, we have studied an ultrahigh quality factor mechanical oscillator coupled to a microwave cavity. We will present an original technique to probe the losses of planar microwave cavities, as well as a resolved sideband cooling technique to actively cool this mechanical oscillator using the microwave cavity. Finally, we will present some optimizations of this experiment which open the path towards the ground state cooling of the mechanical oscillator. Such a hybrid quantum system could be used as an on-chip quantum memory, able to store fragile quantum states generated by superconducting quantum circuits for coherence times approaching a second
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Darginavičius, Julius. "Three and four wave parametric interactions for ultrashort pulse generation in the ultraviolet, near and mid-infrared spectral range." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130925_093240-40423.
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In this thesis we investigated and developed three- and four-wave interaction-based frequency conversion methods for ultrashort pulse generation in the ultraviolet (UV), near and mid-infrared (IR) spectral ranges. In particular, efficient generation of Nd:glass laser harmonics was demonstrated experimentally, through noncollinear four-wave difference-frequency mixing in isotropic media. Also, broadband optical parametric amplification in the UV was investigated theoretically and achieved experimentally. The results suggest, that pulses as short as 10 fs could be amplified. We have also developed two methods based on three- and four-wave mixing, that extend the tuning range of a commercial Ti:sapphire laser-NOPA system in the IR. The first method relies on four wave frequency down-conversion, and can achieve up to 20 μJ, sub-30-fs pulses tunable in the 1−1.5 μm range. The second method considers frequency conversion, based on difference frequency generation and optical parametric amplification in BBO crystals. The presented setup delivers two optical-cycle, carrier-envelope phase (CEP)-stable pulses at 2 μm. And finally, we demonstrated supercontinuum generation by filamentation of 20 fs pulses at 2 μm in wide-bandgap solids in the regime of anomalous group velocity dispersion. We also proposed the practical use of intrinsic third harmonic generation, for the CEP stability measurements.Pagrindinis šios disertacijos tikslas – sukurti efektyvius trijų ir keturių bangų sąveikomis paremtus metodus ultratrumpiesiems ultravioletinės (UV), artimosios bei vidurinės infraraudonosios (IR) spektro srities impulsams generuoti. Pademonstruota efektyvi Nd:stiklo lazerio harmonikų generacija nekolinearaus keturbangio skirtuminio dažnio žadinimo metodu izotropinėse terpėse. Disertacijoje taip pat eksperimentiškai ir teoriškai nagrinėjama galimybė stiprinti 10 fs trukmės UV impulsus. Pateikėme du metodus derinamo bangos ilgio IR impulsams generuoti naudojant komercinę Ti:safyro lazerio ir nekolinearaus optinio parametrinio stiprintuvo sistemą. Pirmasis metodas remiasi keturių bangų sąveikomis ir leidžia generuoti 20 μJ energijos, <30 fs trukmės impulsus 1−1.5 μm spektro ruože. Antrojo šaltinio veika remiasi skirtuminio dažnio generacijos bei optinio parametrinio stiprinimo sąveikomis BBO kristaluose. Sukurtas stiprintuvas, generuojantis dviejų optinių ciklų trukmės, stabilios gaubtinės fazės, 2 μm bangos ilgio impulsus ir pademonstruotas jo taikymas itin plataus spektro superkontinuumo generacijai plačios draustinės juostos kietojo kūno terpėse. Galiausiai, ištirta vienalaikė trečiosios harmonikos ir superkontinuumo generacija skaidriose dielektrinėse terpėse, bei pasiūlyta netiesinio f-3f interferometro schema impulso gaubtinės fazes fliuktuacijoms matuoti.
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Wittmann, Emanuel [Verfasser], and Eberhard [Akademischer Betreuer] Riedle. "Taming optical parametric amplification : stable few cycle pulses at 210 to 10000 nm from Ti:Sapphire and Yb-based lasers / Emanuel Wittmann ; Betreuer: Eberhard Riedle." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1206877715/34.
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Neradovskaia, Elizaveta. "Formation de structures de domaines dans des ferroélectriques uniaxiaux : Applications à l'amplification paramétrique optique de grande ouverture." Thesis, Université Côte d'Azur, 2020. http://theses.univ-cotedazur.fr/2020COAZ4012.
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Сette thèse est consacrée à l'étude de structures de domaines dans des ferroélectriques uniaxiaux et à leur application aux amplificateurs paramétriques optiques à grande ouverture.L'étude de l'évolution de la structure de domaines dans les cristaux ferroélectriques est extrêmement importante tant d'un point de vue fondamental qu’appliqué. La microscopie à sonde à balayage offre une opportunité unique pour une investigation locale des processus d'inversion de polarisation, dont les résultats peuvent être utilisés pour optimiser les méthodes classiques d'ingénierie de domaine. L'utilisation de cristaux ferroélectriques à axe polaire incliné ouvre de nouvelles opportunités pour l'étude in situ de la cinétique de domaine.En outre, l'intérêt pour l'application pratique des monocristaux ferroélectriques a considérablement augmenté en relation avec le développement de la physique des champs forts, qui nécessite la création de nouveaux éléments optiques non linéaires avec une grande ouverture. Ce problème est résolu à l'aide de l'ingénierie de domaine.Ce travail présente à la fois l'étude fondamentale de la cinétique de domaine dans des ferroélectriques classique et relaxeur et l'étude appliquée de la modélisation, de la création et de la caractérisation de mélangeurs optiques à grande ouverture pour des lasers haute puissance sur la base de cristaux de niobate de lithium congruent à polarisation périodique avec l’axe polaire inclinée (CLN incliné).Le chapitre 1 contient les bases théoriques de la physique des ferroélectrique et de l'optique non linéaire. De plus, l'état de l'art est présenté.Le chapitre 2 est consacré aux méthodes expérimentales et aux configurations utilisées pour étudier la structure de domaines des ferroélectriques.L'étude de l'évolution de la structure des domaines dans les ferroélectriques relaxeurs sur l'exemple du niobate de strarytium baryum relaxant (SBN) est présentée au chapitre 3. L'influence d'un état de domaine initial sur la cinétique du domaine lors de l'inversion de polarisation par des méthodes de polarisation intégrales et locales est montrée.Le chapitre 4 est consacré à l'étude de la cinétique de domaines dans les cristaux de niobate de lithium congruents à l’axe polaire incliné. La croissance du domaine vers l'avant pendant le poling de champ électrique et le poling de faisceau électronique est étudiée.La modélisation du mélangeur de fréquence à grande ouverture sur la base de CLN incliné périodique polaire avec différentes orientations des axes cristallins est proposée au chapitre 5. Le modèle est basé sur les principes du quasi-accord de phase eu angle.L'étude de l'amplification paramétrique optique d'impulsions chirped (OPA) dans un 64˚ Y-cut CLN polaire périodique est présentée au chapitre 6. Les dépendances angulaires du gain et de la bande passante spectrale sont décritesThe study of the evolution of the domain structure in ferroelectric crystals is extremely important from a fundamental and applied point of view. Scanning probe microscopy provides a unique opportunity for local investigation of the processes of polarization reversal, the results of which can be used to optimize the classical methods of domain engineering. Using of ferroelectric crystals with slanted polar axis opens new opportunities for in situ investigation of domain kinetics.In addition, interest in the practical application of ferroelectric single crystals has greatly increased in connection with the development of strong field physics, which requires the creation of new nonlinear optical elements with a large aperture. This problem is solved with the help of domain engineering.This work presents both the fundamental study of domain kinetics in classical and relaxor ferroelectrics and the applied investigation of modeling, creation, and characterization of large aperture optical mixers for high-power lasers on the base of periodical poled congruent lithium niobate crystals with the slanted polar axis (slanted CLN).Chapter 1 contains the theoretical basis for the physics of ferroelectrics and nonlinear optics. Also, the state of the art is presented.Chapter 2 is dedicated to experimental methods and setups used for investigation of domain structure in ferroelectrics.The investigation of the evolution of domain structure in relaxor ferroelectrics on the example of model relaxor strontium barium niobate (SBN) is presented in chapter 3. The influence of an initial domain state on domain kinetics during polarization reversal by both integral and local methods of poling is shown.Chapter 4 is devoted to the investigation of domain kinetics in congruent lithium niobate crystals with slanted polar axis. Forward domain growth during electric field poling and e-beam poling is studied.Modeling of large-aperture frequency mixer on base of periodical poled slanted CLN with different crystal axis orientations is offered in chapter 5. Model is based on the principals of angular quasi-phase matching.Study of chirped pulse optical parametric amplification (OPA) in periodical poled 64˚ Y-cut CLN is presented in chapter 6. Angular dependences of gain and spectral bandwidth are described
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Darginavičius, Julius. "Trijų ir keturių bangų parametrinių sąveikų taikymas ultratrumpųjų impulsų generacijai ultravioletiniame, artimajame ir viduriniajame infraraudonajame spektro ruože." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130925_093226-76433.
Full textAbstract:
Pagrindinis šios disertacijos tikslas – sukurti efektyvius trijų ir keturių bangų sąveikomis paremtus metodus ultratrumpiesiems ultravioletinės (UV), artimosios bei vidurinės infraraudonosios (IR) spektro srities impulsams generuoti. Pademonstruota efektyvi Nd:stiklo lazerio harmonikų generacija nekolinearaus keturbangio skirtuminio dažnio žadinimo metodu izotropinėse terpėse. Disertacijoje taip pat eksperimentiškai ir teoriškai nagrinėjama galimybė stiprinti 10 fs trukmės UV impulsus. Pateikėme du metodus derinamo bangos ilgio IR impulsams generuoti naudojant komercinę Ti:safyro lazerio ir nekolinearaus optinio parametrinio stiprintuvo sistemą. Pirmasis metodas remiasi keturių bangų sąveikomis ir leidžia generuoti 20 μJ energijos, <30 fs trukmės impulsus 1−1.5 μm spektro ruože. Antrojo šaltinio veika remiasi skirtuminio dažnio generacijos bei optinio parametrinio stiprinimo sąveikomis BBO kristaluose. Sukurtas stiprintuvas, generuojantis dviejų optinių ciklų trukmės, stabilios gaubtinės fazės, 2 μm bangos ilgio impulsus ir pademonstruotas jo taikymas itin plataus spektro superkontinuumo generacijai plačios draustinės juostos kietojo kūno terpėse. Galiausiai, ištirta vienalaikė trečiosios harmonikos ir superkontinuumo generacija skaidriose dielektrinėse terpėse, bei pasiūlyta netiesinio f-3f interferometro schema impulso gaubtinės fazes fliuktuacijoms matuoti.In this thesis we investigated and developed three- and four-wave interaction-based frequency conversion methods for ultrashort pulse generation in the ultraviolet (UV), near and mid-infrared (IR) spectral ranges. In particular, efficient generation of Nd:glass laser harmonics was demonstrated experimentally, through noncollinear four-wave difference-frequency mixing in isotropic media. Also, broadband optical parametric amplification in the UV was investigated theoretically and achieved experimentally. The results suggest, that pulses as short as 10 fs could be amplified. We have also developed two methods based on three- and four-wave mixing, that extend the tuning range of a commercial Ti:sapphire laser-NOPA system in the IR. The first method relies on four wave frequency down-conversion, and can achieve up to 20 μJ, sub-30-fs pulses tunable in the 1−1.5 μm range. The second method considers frequency conversion, based on difference frequency generation and optical parametric amplification in BBO crystals. The presented setup delivers two optical-cycle, carrier-envelope phase (CEP)-stable pulses at 2 μm. And finally, we demonstrated supercontinuum generation by filamentation of 20 fs pulses at 2 μm in wide-bandgap solids in the regime of anomalous group velocity dispersion. We also proposed the practical use of intrinsic third harmonic generation, for the CEP stability measurements.
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Isaienko, Oleksandr. "Development of ultra-broadband ultrafast infrared sources and applications to nonlinear vibrational spectroscopy of interfaces." Diss., Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/141408.
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ChemistryPh.D.
Interfaces play a crucial role in the exchange of energy and matter in various physical, chemical and biological systems. A particular interest has been to study interfaces between aqueous phases and various minerals because of their importance in understanding geochemical phenomena as well as for applications such as enhanced oil recovery. The nonlinear optical technique of vibrational sum-frequency generation (SFG) spectroscopy, introduced over 20 years ago, has become a powerful tool to investigate various surfaces, in particular, mineral-water interfaces. One of the challenges of the SFG spectroscopy of aqueous surfaces is the need to tune the central frequency of relatively narrowband IR lasers through the broad range of the OH-stretch frequencies of water molecules (3000 - 4000 cm-1). We have developed a novel ultrabroadband IR laser source that generates infrared pulses in the ~2800-6000 cm-1 range (lambda~3300-1800 nm) with bandwidths Delta(nu)>1000 cm-1, and bandwidths >2000 cm-1 in the near-IR range (lambda~1000-2000 nm). Pulse front tilt of signal pulse has been corrected allowing for compression of signal pulses down to 25 fsec. Such ultrabroadband IR pulses allow us to perform SFG spectroscopy of aqueous surfaces over the entire frequency range of water molecule spectrum (extending from ~2900 cm -1 to ~3800 cm -1) simultaneously, without tuning the laser ("in one shot"). We have used this novel ultrabroadband IR source to investigate the vibrational SFG spectra of silica/water interfaces. The high signal-to-noise ratio of our spectroscopic setup has allowed us to study low-intensity features that were not studied in detail, or recognized previously in the SFG-spectroscopy investigations, including: 1) non-hydrogen bonded OH vibrations at hydrophilic silica/water interfaces; 2) combination [stretch+bend] bands of water at the silica surface appearing at ~5000-5200 cm -1. 3) Overtones of water stretching modes at silica/water interfaces. The most important conclusions from these studies are outlined below. 1. Non-hydrogen bonded hydroxyls at silica/water interface. Typically SFG-studies of mineral/water interfaces (in particular, silica/water) have focused on the most pronounced features - peaks of H-bonded hydroxyls at ~3150 and ~3450 cm -1. We have been able to systematically observe and study a weaker peak at ~3670 - 3700 cm -1. This peak becomes more pronounced as the pH of aqueous phase decreases, as well as the ionic strength increases, indicating that the hydroxyls corresponding to this spectral feature are situated in a very close proximity to the surface. Isotopic dilution experiments indicate that the 3700 cm -1 feature is not due to asymmetric OH stretches as was suggested before. Based on our results, we suggest that this spectral feature corresponds to hydroxyls of water molecules at the silica surface that cannot hydrogen bond with silanol groups because of the lower density of silanols compared to H2O. We believe this to be the first surface-specific study of non-hydrogen bonded hydroxyls at silica, a surface widely accepted as hydrophilic. 2. SFG spectroscopy of [ν(OH)+δ(HOH)] combination bands of water at silica surface. We have extended SFG spectroscopy of the interfacial hydroxyls at mineral/water surfaces into the near-IR frequency range. The studies of overtones of interfacial OH(OD) groups will provide information on the anharmonicity of such species, and thus on the energy of dissociation. In addition, the positions of the overtone frequencies of the hydroxyls are more sensitive to interactions with the environment than the fundamental stretch frequencies. Our particular focus has been to study the stretch+bend combination band nu comb nu;(OH)+delta;(HOH) of liquid water which occurs in the near-IR spectral range at ~5000-5200 cm -1. It is typically much weaker in the FTIR absorption spectra than the fundamental transitions of the OH stretches or HOH bending, similar to overtones of these modes. We have performed, what we believe to be, the first surface-specific vibrational SFG spectroscopic measurements of combination bands of water molecules at silica surfaces. SFG spectroscopy of water combination band allows access to the water bending mode (delta~1600 cm -1), which still has not been observed in sum-frequency.
Temple University--Theses
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Jargot, Gaëtan. "High-repetition rate CEP-stable few-cycle OPCPA sources in the short wavelength infrared/mid-infrared." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLO020.
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Résumé : La génération d’impulsions de quelques cycles optiques stabilisées en CEP dans le moyen infrarouge utilisant la technique d’amplification paramétrique optique à fort taux de répétition est d’un grand intérêt pour diverses études de dynamiques ultra-brèves. Les travaux de cette thèse sont directement inscrits dans ce cadre. Nous décrivons un système émettant des impulsions dont le spectre est centré à 2.1 µm avec une durée de 19.5 fs et une énergie de 31 µJ opérant à 10 kHz avec une stabilité RMS de 0.54 %. Ce système se distingue de l’état de l’art par la mise en œuvre d’une technique de différence de fréquence en ligne permettant d’obtenir une stabilité de la CEP tir-à-tir de 107 mrad pendant quatre heures. De plus cette thèse à permis le dévelopement d’un dispositf émettant des impulsions de quelques cycles optiques à 1.55 µm opérant à haut taux de répétition (125 kHz). Ce système est le résultat de l’assemblage d’un amplificateur paramétrique optique et d’un systéme de compression non-lineaire dans une cellule multi-passage. La propagation non linéaire périodique dans la cellule en régime de dispersion anormale permet une compression solitonique, tout en moyennant les effets spatiaux de la nonlinéarité sur le faisceau. Nous démontrons ainsi l’autocompression d’impulsions initiales de 19 µJ 63 fs vers des impulsions en sortie de 14 µJ 22 fsAbstract : The generation of carrier envelope phase (CEP) stable few-cycle pulses in the SWIR/Mid-IR using optical parametric chirped pulse amplification (OPCPA) at high repetition rate is of great interest for several applications in ultrafast dynamics. During this thesis the work was primarily focused on the development of OPCPA sources for attosecond science. We present an OPCPA operating at 2.1 µm delivering 19.5 fs pules duration with an energy of 31 µJ at 10 kHz with a RMS energy stability of 0.54 %. An original architecture using an all-inline difference frequency generation stage allows performances beyond the state of the art in terms of CEP stability. We report RMS CEP fluctuations of 107 mrad RMS measured shot-to-shot over four hours. On another hand, the development of a high repetition rate (125 kHz) OPCPA coupled with an innovative nonlinear compression scheme is described. The OPCPA provides pulses centered at 1.55 µm, with a pulse duration of 63 fs with an energy of 19 µJ after compression. Then a nonlinear compression stage based on a soliton dynamics in a multipass cell is implemented. The periodic propagation inside the cell allows to retain the temporal nonlinear effects, while the spatial nonlinear effects are washed out by the distributed nature of the nonlinearity over a large number of passes. We report the self-compression of 63 fs pulse at 1.5 µm down to 22 fs with an energy of 14 µJ
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Ališauskas, Skirmantas. "Kelių optinių ciklų trukmės impulsų parametrinis stiprinimas infraraudonojoje srityje." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101001_145146-49682.
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Disertacijos darbo tikslas – suformuoti ir parametriškai stiprinti kelių optinių ciklų trukmės impulsus infraraudonojoje srityje Šioje disertacijoje buvo tirtos dvi moduliuotosios fazės („čirpuotų“) impulsų parametrinio stiprinimo sistemos, stiprinančios ypač plataus spektro impulsus 800 nm bei 1,5 μm srityse. Pirmoji sistema skirta tirti galimybę didinti lazerinės spinduliuotės vidutinę galią keliais pluoštais kaupinamame parametriniame stiprintuve; antroji sistema skirta kelių optinių ciklų trukmės stabilios fazės impulsų formavimui 1,5 μm srityje.
Disertacijoje aprašomas I tipo parametrinis stiprintuvas, kurio 2-oji pakopa buvo kaupinama dviem arba trimis nepriklausomų lazerinių šaltinių pluoštais. Nustatyta, kad parametrinį stiprintuvą kaupinant keliais pluoštais stebimas naujų erdvinių komponentų atsiradimas, kuriuos sąlygoja parametrinė pakopinė difrakcija, o tai mažina bendrą sistemos energetinio keitimo efektyvumą.. Darbo metu pademonstruota galimybė mažinti parametrinės difrakcijos sąlygotus nuostolius parametriniame stiprintuve derinant kampus tarp kaupinimo pluoštų. Taip pat pristatomas alternatyvus būdas formuoti didelės energijos (kelių dešimčių milidžaulių) kelių optinių ciklų trukmės stabilios fazės impulsus 1,5 μm srityje. Būdas paremtas sąlyginai siauro spektro 1,5 μm srityje stiprinimu II tipo KTP kristale bei spektro plėtra inertinėse dujose po stiprinimo. 4 pakopų parametriniame stiprintuve pasiekta iki šiol didžiausia 12,5 mJ impulso energija 1,5 μm... [toliau žr. visą tekstą]Main objective of this thesis is to generate and amplify few cycle pulses in the infrared region. In this thesis, two approaches were introduced for few cycle pulse parametric amplification at 800 nm and 1.5 μm. First approach is dedicated for prospects for increasing average power of OPCPA via multi-beam pumping; the second approach is dedicated for generation of carrier-envelope-phase (CEP) stable high energy (up to tens of millijoules) few-cycle pulses at 1.5 μm. An experimental investigation of two or three beams-pumped OPCPA system based on type I BBO crystal is presented. The 2nd OPA stage was pumped by two or three pump beams derived from independent Nd:YAG laser amplifiers. The efficiency of interaction was shown to be comparable to that of single-beam pumped OPA and diminishes only slightly due to cascaded parametric diffraction of interacting waves. The effect was observed and its impact on efficiency of parametric amplification process was shown to decrease at larger intersecting angles of pump. In the prospect, the use of multiple lasers for OPA pumping has an appeal for increasing the repetition rate and consequently the average power of an ultrashort pulse laser system. Finally, the concept and realization of hybrid system based on type II KTP OPCPA and filamentation are described. A CEP-stable 1.5 μm OPCPA system with pulse energies up to 12.5 mJ after 4 OPA stages is demonstrated. Furthermore, self-compression of CEP-stable 2.2 mJ, 74.4 fs, 1.57 μm input... [to full text]
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Hemmer, Michaël. "Few-cycle pulses amplification for attosecond science applications modeling and experiments." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4920.
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The emergence of mode-locked oscillators providing pulses with durations as short as a few electric-field cycles in the near infra-red has paved the way toward electric-field sensitive physics experiments. In addition, the control of the relative phase between the carrier and the pulse envelope, developed in the early 2000's and rewarded by a Nobel price in 2005, now provides unprecedented control over the pulse behaviour. The amplification of such pulses to the millijoule level has been an on-going task in a few world-class laboratories and has triggered the dawn of attoscience, the science of events happening on an attosecond timescale. This work describes the theoretical aspects, modeling and experimental implementation of HERACLES, the Laser Plasma Laboratory optical parametric chirped pulse amplifier (OPCPA) designed to deliver amplified carrier-envelope phase stabilized 8-fs pulses with energy beyond 1 mJ at repetition rates up to 10 kHz at 800 nm central wavelength. The design of the hybrid fiber/solid-state amplifier line delivering 85-ps pulses with energy up to 10 mJ at repetition rates in the multi-kHz regime tailored for pumping the optical parametric amplifier stages is presented. The novel stretcher/compressor design of HERACLES, suitable for handling optical pulses with spectra exceeding 300 nm of bandwidth with unprecedented flexibility, is fully modeled and also presented in the frame of this thesis. Finally, a 3D model of the multi-stage non-collinear optical parametric amplifier is also reported. The current and foreseen overall performances of HERACLES are presented. This facility is designed to enable attosecond physics experiments, high-harmonic generation and physics of plasma studies.ID: 029809569; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 218-230).
Ph.D.
Doctorate
Optics and Photonics
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Tropheme, Benoit. "Combinaison de faisceaux mutuellement incohérents par amplification paramétrique optique." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00864029.
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L'objectif de cette thèse est d'étudier une technique de combinaison cohérente de faisceaux : l'amplification paramétrique optique (OPA) à multiple pompes. Cette technique permet de transférer instantanément l'énergie de nombreuses pompes en un unique faisceau signal sans stockage d'énergie, et ainsi s'affranchissant d'effets thermiques dans le milieu amplificateur. Ceci peut s'avérer intéressant pour combiner l'énergie de multiples lasers à fibre et réaliser l'amplification à forte cadence de lasers très énergétiques ou d'impulsions à spectre large. A l'aide d'un code de calcul général et d'une étude expérimentale utilisant comme cristal non linéaire du BBO ou du LBO, nous calculons dans un premier temps la localisation des pompes autour du signal à amplifier, ainsi que les tolérances angulaires correspondantes qui déterminent la criticité d'alignement d'une telle configuration. Nous nous intéressons ensuite aux mécanismes de recombinaisons parasites entre une pompe et l'idler correspondant à une autre pompe. Après avoir démontré expérimentalement que ces recombinaisons peuvent dégrader les caractéristiques spatiales et spectrales du signal amplifié, nous montrons qu'il est possible d'éliminer ces risques de couplages néfastes en écartant suffisamment les pompes entre elles. Une modélisation originale de l'OPA multi-pompes suggère de relier ces phénomènes parasites aux effets des réseaux résultant des interactions entre les différentes pompes. La dernière partie présente l'expérience d'OPA à 5 pompes qui nous a permis d'atteindre un rendement de transfert énergétique des pompes vers le signal de 27%, et obtenir ainsi un signal plus énergétique que chaque pompe prise séparément.
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Nillon, Julien. "Amplification paramétrique ultra-large bande dans l’ infrarouge en régime de forte énergie et de forte puissance moyenne." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14536/document.
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Alors que la science attoseconde connaît un développement fulgurant, le besoin de nouvelles sources laser adaptées à la génération d'impulsions attosecondes uniques est apparu. Grâce à ses propriétés d'accordabilité en fréquence et d'amplification de spectres ultra-larges à même de supporter des durées d'impulsions ultracourtes, conjuguées à la possibilité de stabiliser passivement la phase sous l'enveloppe (CEP) du champ électrique associé à l'impulsion laser, l'amplification paramétrique (OPA) s'est imposée comme un des outils incontournables pour la réalisation de telles sources.De plus, un intérêt croissant se manifeste pour la montée en cadence des sources d'harmoniques d'ordre élevé (HHG), en tirant parti des avancées des laser à fibre. Récemment fut démontrée la génération d'impulsions ultracourtes à très haute cadence, stabilisées en phase, dans la partie visible du spectre. Décaler la bande d'amplification vers l'infrarouge présenterait des avantages certains du point de vue de la génération d'harmoniques. En effet, travailler avec une source laser infrarouge permet d'étendre le spectre d'harmoniques et donc de réduire la durée des impulsions attosecondes générées. Jusqu'à présent, l'amplification paramétrique large bande dans l'infrarouge à haute cadence était rendue impossible par la difficulté à générer un signal à ces longueurs d'onde directement à partir d'un laser à fibre.Les travaux exposés ici décrivent la réalisation de nouvelles sources paramétriques, spécifiquement conçues en fonction des exigences de la génération d'impulsions attosecondes uniques, aussi bien en régime de forte énergie qu'à des cadences élevées.Nous présentons tout d'abord le développement d'un OPA avec stabilisation passive de la CEP, capable d'amplifier un spectre d'une largeur de 700 nm centré à 1,75 µm et délivrant une énergie de 450 µJ à la cadence de 10 Hz. Puis, nous détaillons une architecture originale d'amplification paramétrique à haute cadence pompé par un laser à fibre, qui nous a permis de générer des impulsions stabilisées en phase d'une durée inférieure à trois cycles optiques à la longueur d'onde centrale de 2,2 µm, avec une énergie de 5 µJ à la cadence de 100 kHz.Enfin, nous explorons la possibilité d'accroître la puissance de sortie des OPA infrarouges large bande à des niveaux de plusieurs dizaines de watts, grâce à la technique de combinaison paramétrique de plusieurs faisceaux de pompe fibrésWhile attosecond science reaches new frontiers in physics, the need for innovative primary sources suited for the generation of single attosecond (as) pulses emerges. Featuring high tunability, ultra-broadband amplification bandwidth and the ability of passively stabilizing the random Carrier-Envelope Phase (CEP) of any pump laser, Optical Parametric Amplification (OPA) has proven to be one of the most effective tools to meet the stringent requirements of High-Order Harmonics (HHG) driving sources.Moreover, there is a growing interest for higher repetition rate HHG sources, pumped by Ytterbium-doped fiber lasers. High-repetition rate, CEP-stable, few cycle pulses have been successfully generated by OPAs operating in the visible part of the spectrum. Shifting the amplified bandwidth towards longer wavelengths would be clearly profitable. In fact, the shorter harmonic wavelength cut-off will allow significantly extending the harmonics spectrum and consequently shorten as pulse durations. Until know, generation of CEP-stable, few-cycle pulses in the infrared at ultra-high repetition rates was impossible due to the issue of generating a broadband infrared seed directly from a fiber laser. This thesis describes the implementation of new supercontinuum-seeded parametric sources, specifically designed for isolated attosecond pulses generation with high energy or high repetition rate.The development of a CEP-stable three-stages OPA source is reported, amplifying a 700 nm broad spectrum at a central wavelength of 1,75 µm with an energy of 450 µJ at a 10 Hz repetition rate. Then, a new architecture based on a two-stage cascaded OPA pumped by a home-made fiber laser is presented, which allowed us to generate CEP-stable 3-cycles pulses at the central wavelength of 2,2 µm, with an energy of 5 µJ at 100 kHz. Finally, we discuss the possibility of increasing the output power of parametric amplifiers to several tens of watts with broadband parametric combination of several fiber-pump beams
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Alhenc-Gelas, Claire. "Etude de la conversion de fréquence par amplification paramètrique dans les fibres optiques transparentes dans l'infrarouge." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00676557.
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De nombreuses applications militaires ou civiles, telles que la spectroscopie dans les bandes de transmission de l'atmosphère (bandes 3-5µm et 8-12µm), nécessitent de disposer de sources émettant dans le moyen infrarouge (IR). Les travaux de cette thèse portent sur la génération de rayonnement dans la bande 3-5µm par amplification paramétrique (mélange à quatre ondes) dans les fibres optiques en verres fluorés et en verres de chalcogénures. La première partie de ce travail a été consacrée à l'étude théorique et à la modélisation des conditions d'accord de phase et du gain paramétrique dans des fibres à saut d'indice monomodes en verres fluorés ZBLAN et verres de chalcogénures As2S3 et As2Se3. La nature des résultats obtenus nous a conduit à étudier théoriquement le potentiel de l'accord de phase multimode dans les fibres en verres de chalcogénures. La deuxième partie de ce travail a porté sur la modélisation de l'amplification paramétrique dans des fibres en verres de chalcogénures microstructurées à géométrie hexagonale. Pour ce faire, un modèle simplifié de la propagation dans les fibres microstructurées hexagonales a été développé : le modèle de l'indice effectif de gaine (EIM). Il a ensuite été comparé à une méthode de résolution aux éléments finis. Grâce à cette comparaison, nous avons pu améliorer la précision du modèle EIM en déterminant la valeur de plusieurs paramètres empiriques. Ce modèle nous a alors permis de prédire l'efficacité du processus d'amplification paramétrique dans les fibres microstructurées. L'ensemble de ces études théoriques a permis d'identifier les fibres les plus adaptées à la conversion de fréquence vers la bande 3-5µm. Enfin, nous avons réalisé un banc de mesure de la dispersion chromatique des fibres, ainsi que le dimensionnement d'un convertisseur de fréquence utilisant les fibres identifiées dans l'étude théorique.
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Chiaramello, Marco. "Laser amplification via stimulated Brillouin scattering in the strongly coupled regime : towards control and optimization." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066304/document.
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L'utilisation de plasmas comme milieu amplificateur d'impulsions laser intenses pourrait permettre de surmonter les limites de la technologie actuelle en termes de l'intensité maximum réalisable. Par l'intermédiaire d'une oscillation de plasma, l'énergie d'une longue impulsion laser de pompe peut être transférée à une impulsion courte (« seed »). La rétrodiffusion Brillouin a le potentiel pour devenir un processus d'amplification robuste. Dans cette thèse, nous présentons des études théoriques et numériques visant à mieux comprendre le rôle de chaque paramètre du plasma et de la pompe sur le mécanisme d'amplification: forme et longueur du profil de densité, durée de la pompe, retard relatif entre la pompe et le seed, et chirp (dérive en fréquence) de la pompe. Nous montrons une première description complète de l'évolution dans le temps et dans l'espace des phases de la pompe, du seed et de la perturbation de densité plasma, qui déterminent le sens du transfert d'énergie entre les faisceaux laser et l'efficacité de l'amplification. Afin de proposer et d'améliorer les schémas expérimentaux actuels, une comparaison est effectuée avec les expériences récentesThe use of plasma as an amplification medium is currently discussed because it can overcome current solid-state technology limitations in terms of maximum achievable intensity. Via parametric scattering off a plasma oscillation the energy from a long pump pulse can be transferred into a short seed pulse. Brillouin scattering has the potential to become a robust amplification process. In this thesis we present theoretical and numerical (PIC) studies aimed at better understanding the role of each plasma parameter on the amplification mechanism: the interaction length, the shape of the density profile, the duration of the long pump signal, the relative delay between the seed and pump signals, the chirp of the long pump laser pulse. For the first time we show complete description of the time and space evolution of the phases of the pump, seed and plasma density perturbation that dictate the energy flow transfer between the pump and seed laser beams and the efficiency of amplification. In order to propose and improve nowadays experimental set-ups, a comparison with recent experiments is performed
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Chatterjee, Debanuj. "A theoretical investigation of fiber phase sensitive amplifiers for applications." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP008.
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Les amplificateurs paramétriques à fibre optique (FOPA) sont prometteurs pour les systèmes de communication de demain. En particulier, les amplificateurs sensibles à la phase des fibres offrent des fonctionnalités intéressantes comme un faible bruit et un gain élevé, ce qui en fait des candidats potentiels pour des applications dans les liaisons photoniques micro-ondes. Cette thèse propose une étude théorique de tels amplificateurs sensibles à la phase destinés à certaines applications.La première partie de la thèse est consacrée au développement d'un modèle analytique pour la propagation de sept ondes continues à travers un FOPA. Le système est résolu lorsque les effets non linéaires de la fibre ne sont pas trop forts. Le modèle développé révèle le rôle important des ondes d'ordre supérieur dans la détermination des performances d'amplification du FOPA. Des stratégies sont formulées pour améliorer l'amplification. La possibilité d'une conversion de fréquence sensible à la phase avec seulement deux ondes de pompe est également prédite.Dans la deuxième partie de cette thèse, la possibilité d'introduire un amplificateur sensible à la phase dans une liaison photonique hyperfréquence pour la distribution de signaux analogiques est étudiée. Un modèle numérique est utilisé pour simuler comment les non-linéarités RF dans une liaison photonique hyperfréquence sont amplifiées par le FOPA. Les performances de la liaison lorsque le FOPA atteint la saturation du gain sont également étudiées. L'étude révèle la possibilité d'une atténuation de la non-linéarité RF en utilisant la non-linéarité de la fibre. La mise en œuvre de telles techniques pourrait conduire à la réalisation de liaisons photoniques hyperfréquences à longue portée et hautement linéaires pour les applications de déport d'antenneFiber optic parametric amplifiers (FOPA) are promising for tomorrow's communication systems. In particular, fiber phase sensitive amplifiers offer attractive functionalities like low noise and high gain which makes it a potential candidate for applications in microwave photonic links. This thesis provides a theoretical investigation of such fiber phase sensitive amplifiers aimed towards applications.The first part of the thesis is dedicated towards development of an analytical model for propagation of seven CW waves through a FOPA. The system was solved exactly when nonlinear effects of the fiber are not strong. The developed model unravelled the important role of the higher order waves in determining the amplification performance of the FOPA. Strategies were formulated to enhance the amplification and the possibility of a phase sensitive frequency conversion with just two pump waves was also predicted.In the second part of this thesis, the possibility of introducing a fiber phase sensitive amplifier in a microwave photonic link for analog signal distribution was investigated. A numerical model was utilized to simulate how the RF nonlinearities in a microwave photonic link are amplified by the FOPA. The performance of the link when the FOPA attains a gain saturation was also studied. The study revealed the possibility of RF nonlinearity mitigation using the fiber nonlinearity. Implementation of such techniques could lead to realization of long-range and highly linear microwave photonic links for antenna remoting applications
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Mendonça, Marcela de Freitas. "Projeto e construção de um amplificador paramétrico óptico operando no infravermelho médio." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14062010-162036/.
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Um Amplificador Paramétrico Óptico (optical parametric amplifier - OPA) é uma fonte de luz coerente, de alta qualidade e sintonizável, baseada em processos ópticos não-lineares de segunda ordem. Alguns modelos possuem largura de banda estreita e um amplo intervalo de sintonia, podendo alcançar regiões que vão desde o ultravioleta até o infravermelho médio. A nossa motivação para construir este amplificador paramétrico óptico é sua utilização em experimentos de espectroscopia vibracional de superfícies através do processo óptico não-linear de segunda ordem, geração de soma de frequências (sum-frequency generation - SFG), que é uma técnica que exige fontes sintonizáveis no infravermelho médio e com altas intensidades de pico e largura de banda estreita. O objetivo desse trabalho foi projetar, montar e testar um amplificador paramétrico óptico capaz de produzir pulsos sintonizáveis de alta energia no infravermelho médio (λ ~ 2,5 a 10 μm) a partir de um laser de bombeio que fornece pulsos de 25 ps, com alta energia em λ = 1064 nm. Para obter-se uma geração de infravermelho bastante eficiente, foi proposto um projeto inovador para amplificadores paramétricos de picossegundos, utilizando-se a geração de supercontínuo de luz branca como feixe sinal do estágio de amplificação paramétrica. O pulso de bombeio (λ = 1064 nm) é dividido em duas partes: a primeira, de menor energia, é utilizada para gerar um pulso de alta largura espectral no infravermelho próximo (supercontínuo de luz branca de picossegundos). Uma fração espectral desse pulso é selecionada através de um monocromador e utilizada como semente do estágio de amplificação paramétrica. O cristal amplificador paramétrico (sulfeto de prata e gálio, AgGaS2) é então bombeado pelo restante do pulso de bombeio e simultaneamente amplifica a semente sintonizável no infravermelho próximo e gera um novo pulso de frequência complementar no infravermelho médio. Foram testados vários meios para geração de supercontínuo, mas os melhores resultados foram obtidos em uma cubeta de 10 cm de comprimento com uma mistura de água e água deuterada (3 % em volume de H2O em D2O) e em uma fibra fotônica não-linear com 2 m de comprimento. Usando o supercontínuo como feixe semente, observou-se amplificação paramétrica no caso do feixe gerado na fibra fotônica com um ganho de 260 vezes, mas não com o feixe gerado na mistura de água/água deuterada, presumivelmente pela maior instabilidade desse supercontínuo.An Optical Parametric Amplifier (OPA) is a tunable light source of high quality, coherent radiation, based on second-order nonlinear optical processes. Some models have a narrow spectral bandwidth and a tuning range from the ultraviolet to the mid-infrared. The motivation for building this optical parametric amplifier is its use in vibrational spectroscopy of surfaces by a second-order nonlinear optical process, sum-frequency generation (SFG), which is a technique that requires tunable sources in the mid-infrared with narrow bandwidth and high peak intensities. The purpose of this work is to design, implement and test an OPA to generate tunable high energy pulses tuneable in the mid-infrared (λ ~ 2.5 to 10 μm) from a pumping laser that provides 25 ps pulses with high energy at λ = 1064 nm. For an efficient mid-infrared generation, we propose an innovative design for picosecond parametric amplifiers, using the near infrared portion of a white-light supercontinuum pulse as the seed beam for the parametric amplifier. The pump pulse (λ = 1064 nm) is divided into two parts: the first one, with lower energy, generates a high spectral width pulse in the near infrared (white-light supercontinuum picosecond pulse). A spectral fraction of this pulse is selected through a monochromator and is used as seed for the parametric amplification stage. The second part of the laser beam pumps the parametric amplifier crystal (silver gallium sulfide, AgGaS2) which simultaneously amplifies the tunable seed beam in the near infrared and generates a new pulse with complementary frequency in the mid-infrared. Several media were tested for supercontinuum generation, but the best results were obtained with a 10 cm long cuvette with a mixture of water and deuterated water (3 % volume of H2O in D2O) and with a 2 m long nonlinear photonic crystal fiber. Using the supercontinuum as a seed beam, we have obtained parametric amplification of the seed generated by the photonic fiber with a gain of 260 times, but not of the beam generated by the water mixture, presumably because of its significantly higher instability.
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Vyvlečka, Michal. "Vysokovýkonný zdroj pikosekundových optických pulzů ve střední infračervené oblasti." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-355678.
Full textAbstract:
1 Title: High-average power picosecond mid-IR source Author: Michal Vyvlečka Department: Department of Chemical Physics and Optics Supervisor: Ing. Ondřej Novák, Ph.D., Hilase centre, Institute of Physics of CAS Abstract: High average power wavelength tunable picosecond mid-IR source based on optical parametric generation (OPG) and optical parametric amplification (OPA) is being developed. The conversion system is pumped by an Yb:YAG thin-disk laser delivering 100 W of average power at 100 kHz repetition rate, 1030 nm wavelength, and 2-3 ps pulse width. Part of this fundamental beam pumps an OPG process in a PPLN crystal. The generated wavelength is determined by PPLN's poling period and temperature. Tunability of the signal wavelength between 1.46 µm and 1.95 µm was achieved, the signal beam of 20 mW was generated at 2 W of pump power, when double pass of the beams through PPLN crystal was used. The corresponding idler wavelengths were in range 2.18-3.50 μm. The signal beam was further amplified by OPA process in two KTP crystals, which was pumped by the fundamental beam. The signal beam was amplified up to 2 W at pumping of 38 W. Tuning of the output wavelength was realized by change of the phase-matching angle in KTP crystals. Tunability between 1.70-1.95 µm for signal and 2.18-2.62 µm for idler was...
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"Advanced schemes of parametric amplification and processing in highly nonlinear fibers." 2014. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1290646.
Full textAbstract:
Optical amplification and signal processing are of great importance to ensure reliable operation of fiber-optic networks. The capacity of optical networks are growing rapidly to deal with the ever-growing Internet traffic demand, which requires optical amplification and signal processing to have ultra-fast response, wide operation bandwidth, flexible operation spectral range and transparency to different modulation formats. In this regard, fiber optical parametric amplifiers (FOPAs), which rely on the efficient parametric process in highly nonlinear fibers, are promising to operate as amplifiers and signal processers in future high-capacity optical networks. This thesis focuses on the advanced schemes of optical amplification and signal processing based on FOPAs to cope with the developing optical networks.New optical amplifiers are highly desirable for previously unused optical bands to increase aggregate optical communication bandwidth. Raman-assisted FOPAs are promising because they can provide higher gain efficiency than Raman amplifiers and more flexible operation spectral range than the conventional FOPAs. Gain saturation is an important property of parametric amplification, which may result in signal distortion during amplification but can be utilized for optical regeneration. In this thesis, gain saturation characteristics in a Raman-assisted FOPA are experimentally observed and theoretically analyzed through simulations. As compared to a conventional FOPA, gain saturation is deferred with enhanced saturated output power and the saturated gain spectrum is broadened with suppressed signal wavelength dependence in the Raman-assisted FOPA. The novel saturation behaviors are explained by the modification of the parametric pump power and nonlinear phase mismatch by the backward Raman amplification. Moreover, controlling saturation behaviors by tuning the Raman gain on the parametric pump are demonstrated.
Amplification performance of Raman-assisted FOPAs is further investigated, including single-channel amplification incorporating with coherent reception and multi-channel amplification for wavelength division multiplexing (WDM) systems. In the single-channel amplification, sufficient amplification performance for the QPSK signal has been successfully achieved in two Raman-assisted FOPAs with the same signal gain of 19 dB but different pump power combinations. In addition, the FOPA with a higher Raman pump is more advantageous due to the wider gain bandwidth and the deferred signal gain saturation. Nonlinear crosstalk is the major restriction of FOPAs for multi-channel amplification in WDM systems. We propose and demonstrate suppression of cross-gain modulation (XGM) crosstalk and four-wave mixing (FWM) crosstalk using a Raman-assisted FOPA. The performances are compared between FOPAs with and without the Raman pump under the condition of identical unsaturated gains. The reduction of XGM crosstalk utilizes the deferred gain saturation in the Raman-assisted FOPA which implies a larger range of input signal power for a constant gain. On the other hand, the suppression of FWM crosstalk is based on the unique signal power evolution which has a crescent slope along the fiber. Accordingly, the performance of multi-channel amplification has been improved in the Raman-assisted FOPA.
Polarization division multiplexing (PDM) in combination with phase-shift keying (PSK) signals is being increasingly employed to improve the spectral efficiency of optical networks. Gain-saturated FOPA is an attractive approach to reduce the nonlinear phase noise and improve the transmission performance by suppressing the amplitude noise of PSK signals. In this thesis, saturation characteristics of FOPA are investigated in terms of input signal polarizations. Our theoretical analysis and experimental results show that PDM signals exhibit nearly identical saturation behaviors when two orthogonal polarized pumps are applied. In addition, polarization-insensitive gain saturation can be achieved by optimizing the pump powers. We report the experimental demonstration on polarization-insensitive amplitude regeneration of 40-Gb/s DPSK signals and amplitude regeneration of 80-Gb/s PDM RZ-DPSK signals.
光信號的放大和處理在確保光纖通信網絡的可靠運行中起著至關重要的作用。隨著因特網流量需求的不斷增長，光網絡的容量也在高速增長，這就要求光信號的放大和處理具有超快的響應速度，更大的工作帶寬，靈活可調的光譜範圍以及對不同調制格式的透明度。光纖參量放大器是一種基於高非線性光纖的高效率參量過程的多功能器件，非常適合用於未來高容量光網絡中的光信號放大和處理。本論文將致力於研究基於光纖參量放大器的先進技術以適用於快速發展的光通信網絡中光信號的放大和處理。
為了拓展總的光通信帶寬，適用於新的光學波段的新型光放大器是非常重要的。拉曼輔助光纖參量放大器具有高於拉曼放大器的增益效率，與傳統的光纖參量放大器相比更加靈活的工作光譜範圍，是一種優秀的新型光放大器。增益飽和是參量放大過程的一種重要特性，它既可能引進放大過程中的信號損傷，又可用於全光再生。本文通過實驗觀察和理論模擬研究了拉曼輔助光纖參量放大器的增益飽和特性。與傳統的光纖參量放大器相比，拉曼輔助光纖參量放大器需要更高的信號輸入功率以達到增益飽和，具有增強的飽和輸出功率。飽和條件下其增益光譜被展寬，而飽和特性與信號波長的相關性被減弱。通過模擬計算，我們得出這些新穎的飽和特性的物理解釋：反向的拉曼放大過程改變了參量泵浦功率和非線性相位失配在光纖中的分布。另外，通過調節參量泵浦的拉曼增益，我們還展示信號增益飽和特性的控制。
我們進一步研究了拉曼輔助光纖參量放大器在信號放大方面的性能，包括了單通道信號的放大和波分復用系統中多通道信號的放大。在單通道信號放大的研究中，我們研究了兩種具有不同泵浦功率組合的放大器，而這兩種放大器都提供19dB的增益。實驗中，我們采用相幹接收對放大後的四相相移鍵控信號進行分析，發現兩種放大器都具有令人滿意的放大效果。同時我們還發現其中具有高的拉曼泵浦功率的放大器更有優勢，因為它能夠提供更大的增益帶寬和更加延遲的信號增益飽和。非線性串擾是光纖參量放大器應用於波分復用系統中多波長信號放大的主要障礙。我們提出拉曼輔助光纖參量放大器可用於抑制多通道信號放大時的交叉增益調制串擾和四波混頻串擾。在我們的研究中，拉曼輔助光纖參量放大器在多通道放大方面的優越性能是通過與具有相同線性增益的傳統光纖參量放大器進行比較體現出來的。拉曼輔助光纖參量放大器的延遲增益飽和說明了在更大的信號輸入光功率範圍內不會引起參量泵浦的明顯減弱，因而可以用於抑制交叉增益調制串擾。另一方面，拉曼輔助光纖參量放大器使信號在光纖中具有獨特的功率演變過程，可用於降低四波混頻串擾。因此，我們利用拉曼輔助光纖參量放大器成功地提高了多通道放大的信號質量。
偏振復用技術與相移鍵控調制格式的結合越來越多地被用於提高光網絡的頻譜效率。光纖參量放大器的增益飽和是一種很有吸引力的抑制相移鍵控信號幅度噪聲的方法，可以有效地降低非線性相位噪聲從而提高傳輸性能。本文研究了不同信號偏振情況下光纖參量放大器的增益飽和特性。理論分析和實驗結果都顯示在采用正交偏振的參量泵浦時偏振復用信號具有相同的增益飽和特性。另外，偏振不敏感的增益飽和可以通過調節泵浦功率實現。我們成功展示了40-Gb/s非歸零差分相移鍵控信號的偏振不敏感幅度再生以及80-Gb/s偏振復用歸零差分相移鍵控信號的幅度再生。
Guo, Xiaojie.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2014.
Includes bibliographical references.
Abstracts also in Chinese.
Title from PDF title page (viewed on 12, September, 2016).
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
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Tu, Wei-Chung, and 凃韋仲. "Generation of Mid-infrared Ultrashort Pulses by Optical Parametric Amplification." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/30045053406207023118.
Full textAbstract:
碩士國立清華大學
光電工程研究所
104
Mid-infrared refers to electromagnetic waves in the wavelength range of 3-50 μm, thus the development of mid-infrared is important for the studies of chemistry, physics and biology. Optical parametric amplification (OPA) is a nonlinear optical effect that is commonly used to generate mid-infrared pulses. We have designed a simple OPA system pumped by a Ti:sapphire laser amplifier that produces 25 fs pump pulses at 1 kHz repetition rate with wavelength range centered at 800 nm. We have tapped a small part of energy of a pump pulse to generate a signal pulse centered at 1064 nm via white-light continuum. The idler pulses we have gotten by OPA are mid-infrared ultrashort pulses. This thesis explains how we chose the parameters of the nonlinear crystal, the theories of the mechanisms involved in the experiment, experimental setup, and the advantages of this OPA system in detail. In this thesis we have shown the numerical simulation and the experimental results to prove that we have successfully generated mid-infrared ultrashort pulses. Its wavelength range is centered at 3200 nm. If the mid-infrared pulses we generated are compressed properly in the future, its pulse duration will have a good chance to reach tens of femtoseconds.
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Hsu, Che-Jui, and 許哲睿. "The study of terahertz optical parametric amplification in ε-GaSe crystals." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/49812491994669080600.
Full textAbstract:
碩士國立交通大學
光電工程系所
95
Optical constants of pure and 0.2% Er:GaSe in 0.2 – 1.2 THz region are determined by THz-TDS. The refractive indexes for both crystals are 3.2 and absorption coefficients are 5(cm-1) and 55 (cm-1), respectively. A phonon vibration is observed at 0.589 THz for both crystals. By use of Lorentz – Drude model, the conductivity can be further calculated from experimental measurement. The parameters such as relaxation rate and momentum relaxation time are also derived. The mobility u=81(cm^2/Vs)for pure GaSe and u=39(cm^2/Vs) for Er:GaSe are also proposed. Femtosecond Laser induced plasma based on the third order nonlinearity is successfully utilized to construct the THz-TDS. The properties of the THz radiation from this configuration is characterized by altering the phase difference, the angle of polarization and intensity between fundamental beam (800nm) and second harmonic beam (400nm). Terahertz enhancement/amplification is preliminarily performed in our studies. The gain could be as high as 150% under the phase matching condition around 1THz.
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Chao-Kuei, Lee, and 李晁逵. "Optical Parametric Amplification: Applications in Generation of ultrafast Optical Pulses and Diagnostics of ultraweak signal." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/05864297205842848627.
Full textAbstract:
博士國立交通大學
光電工程所
92
In this dissertation, using the noncollinear optical parametric amplification (NOPA), a novel tunable blue/UV femtosecond laser system, characterization of ultraweak signal, and ultrabroad band OPA were developed. This femtosecond laser source can remove the tuning gap of a typical femtosecond-laser-based optical parametric amplifier without additional frequency conversion devices. The new source can be highly useful fro studies of topics ranging from wide-bandgap material to biophotonics. For the characterization of ultraweak signal, the optical parametric amplification frequency-resolved-optical-gating (OPA-FROG) design provides unique opportunity for detection of ultrafast optical signals down to sub-femto joule level. More importantly, the apparatus yields pulse characteristics in complete field fashion (i.e., the pulse envelope and phase in single-shot detection). Numerous applications, which are previously not feasible owing to either too weak signal or not repeatable, become realizable. Furthermore, a novel method, was developed to generate an ultrabroad band OPA (white light OPA) with bandwidth, >300nm, in a shingle-shot fashion. For the novel tunable femtosecond laser source, we have studied both theoretical and experimentally the generation of femtosecond laser pulses tunable from 380nm to 460nm via cascading sum-frequency-generation (SFG) in a 405nm-pumped type-I non-collinearly phase-matched OPA. Tuning range at various seeding angles, conversion efficiency and pulse profile are investigated. The energy conversion efficiency of the cascading SFG is higher than 5%. The reported scheme provides a simple while effective way to extend the tuning range of a 405nm pumped type-I BBO-OPA from 460nm down to 380nm without any additional frequency up-conversion stage. It is also found that the beam quality and pulse shape of the SFG component is about the same as that of the regular OPA output. For ultraweak and ultrafast signal diagnostics, we propose and demonstrate both a scanning and a single-shot scheme of the OPA FROG, which have high gain. Further, we have demonstrated a new variation of the existing XFROG technique called OPA XFROG in our lab for the first time. Our OPA XFROG measurement of WLS after blue bandpass filter-- attenuated to only 10 attojoules--is demonstrated. Few tens photon sensitivity was performed. It is the most sensitive light-pulse-measurement technique now available. Unlike Interferometric methods, it does not carry prohibitively restrictive requirements, such as mode-matching, perfect spatial coherence, and highly stable absolute phase. It has potential impact in discovery of novel phenomena and advanced photonic research which yield extremely weak signal and at long wavelength. Moreover, we modify the OPA FROG to overcome and extend facility in pulse to pulse monitoring. Single-shot configuration was used and the design was named as single-shot OPA FROG. Optical parametric gain as high as 108 with 0.8-0.9 femto-joules sensitivity had been demonstrated with an un-cooled CCD in this study. The experimental FROG traces have been successfully retrieved with an error no worse than 0.0014. The measurable wavelength range of the light pulses can cover from the visible to the IR, depending on the phase-matching of nonlinear crystal used, the pump wavelength, and the detailed configuration of OPA. The device has been used in study of mechanism of white-light supercontinuum at high pumping intensity above the threshold of multifilament formation where the signal is irreproducible from shot to shot. In the ultrabroad band white light OPA generation, through noncollinear optical parametric generation and single-shot configuration between pump and seed beam, we demonstrate an ultrabroad band optical parametric amplification. Theoretical calculation reveals that broadening band is predicable in multi-beam pumped OPA. Over 300nm bandwidth of output was achieved. The bandwidth is insensitive to tuning the crystal angle and pump-seed delay was demonstrated. It is believed to due to the noncollinear and single-shot configuration. Below 3 fs could be expectable if appropriate pulse compression, such as group delay line.
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曾彥偉. "High repetition rate optical parametric amplification based on a single Yb:fiber laser." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/12883796416628925338.
Full textAbstract:
碩士國立臺灣師範大學
物理學系
99
Tunable ultrafast light sources are important for various spectroscopic and microscopic applications. We have demonstrated a 700 nm – 1900 nm wavelength-tunable light source based on a single-pass optical parametric amplification (OPA) in a multi-period magnesium oxide doped periodically poled lithium niobate (MgO:PPLN) crystal. The OPA pump was a frequency-doubled ultrafast ytterbium-doped fiber laser and the residual laser power after frequency doubling was recycled to generate a supercontinuum seeding source in a photonic crystal fiber. Compared with conventional OPAs, this system is free from timing jitter between the pump and the seed. Combined with the double seed scheme and the high efficient crystal, PPLN, these are responsible for the high conversion efficiency. Over 40% conversion efficiency was obtained with 10 nJ pump energy. Combined with a 50 MHz repetition rate, this versatile source is ideal for biomedical and spectroscopic applications. Moreover, this is the highest single-pass OPA efficiency at such high repetition rate.
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Giordano, Hugo. "Development of a high-power, ultrashort pulse duration optical parametric amplification system." Phd thesis, 1998. http://hdl.handle.net/1885/144651.
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Jiun-Cheng, Wang. "Femtosecond nonlinear optics in optical parametric amplification and pulse-shaping phenomena of semiconductors." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1707200612220300.
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Wang, Jiun-Cheng, and 王俊程. "Femtosecond nonlinear optics in optical parametric amplification and pulse-shaping phenomena of semiconductors." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83224212716296237573.
Full textAbstract:
博士國立臺灣大學
光電工程學研究所
94
This thesis presents investigations of nonlinear optical interaction between femtoseond laser pulses and materials. The first part focuses on femtosecond optical parametric amplification. A high power femtosecond optical parametric amplifier is demonstrated. A complete simulation approach is developed and demonstrated to successfully describe the output characteristics of the real optical parametric amplifier. This simulation approach is used as an analytic tool to investigate the dynamical interaction between material dispersion and three-wave nonlinear coupling during the amplification process. Several critical issues are addressed. A designed procedure of femtosecond optical parametric amplifiers is proposed. The second part focuses on the pulse-shaping phenomena of semiconductors. A high precision femtosecond laser pulse measurement technique is demonstrated. It is frequency-resolved optical gating based on two-beam coupling. Its precision and accuracy is examined before applying it to subsequent experiments. Pulse-shaping effects of gallium arsenide and semiconductor saturable absorber mirror have been successfully unveiled. Dielectric functions modified by photoexcited carriers are used to interpret experimental results. Observed pulse-shaping effects of semiconductor saturable absorber mirror are compared to theoretical prediction.
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Kan, Che-Wei, and 甘哲維. "High-efficiency Optical Parametric Amplification as a Laser Source Applied to Deep-tissue Multiphoton Microscopy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/72679556839974942228.
Full textAbstract:
碩士國立臺灣大學
應用物理所
102
Since Hooke first used optical microscope to observe the plate cells in 1665, optical microscope has been widely applied to biomedical image. Convention optical microscope doesn’t provide optical sectioning which makes it fail to recognize signals from the depth of signals. Later in 1957, Marvin Lee Minsky displayed the confocal fluorescence microscope which has optical section. However, as we know from the theory of scattering, the shorter wavelength is, the stronger scattering will be, the penetration depth is highly related to wavelength. Generally, visible light is the source of confocal fluorescence microscopy, which restricts its penetration depth 100 μm. On the contrary, multiphoton microscopy usually uses infrared light as its source and thus has higher penetration depth because it has longer wavelength and lower scattering. Besides, the whole process is nonlinear, which means the signal power increases nonlinearly by source intensity. Only signal from focus spot is enough for detecting. Therefore, multiphoton microscopy also has optical section. From previous perspective, my core question is that whether we can get unlimited high penetration depth by lengthening the wavelength. Take biological sample into consideration, which mainly contains water. Water strongly absorb EM-wave of wavelength near 1.4 μm, which is unsuitable for biomedical imaging. In order to lengthen the wavelength as much as possible and avoid the absorption of water, light between 1.3~1.4 μm would be very suitable for deep-tissue imaging. People often use Ti: sapphire laser with optical parametric oscillator (Ti:sa + OPO), Supercontinuum generation laser (SC) and Cr: forsterite to generate 1.3~1.4 μm laser source. Ti:sa + OPO has ultrashort pulse which is often shorter than 100 fs and its peak wavelength can be fast tuned. But its output power is limited and oscillator is complex setup. SC usually uses photonic crystal fiber to generate. Its advantage is that spectrum is very broad, which is from ultraviolet to infrared. However, because it is broadband laser, its spectral power is low, usually ___. And the dispersion of fiber causes long pulse, which is not suitable for multiphoton microscopy. Cr:forsterite can achieve high output power, but its oscillator makes setup complex and less robust. How can we achieve easily single pass and high output power laser source with 1.3~1.4 μm wavelength? The aforementioned lasers all have some defects, which don’t fit our requirement. Our experiment succeeds in creating optical parametric generation/amplification record. We generate the pulse laser, whose output power is over 1 W, quantum efficiency (the number of the output photons/the number of the input photons) achieves 60% at high repetition rate, wavelength 1.3~1.4 μm and pulsewidth 1 ps. Besides, using 1.36 μm as source, which we generate, of multiphoton microscopy is success getting the second harmonic generation bulk image of the type 1 collagen. To compare the image with 1 μm as source obviously, 1.36 μm as source can get deeper image. It proved 1.36 μm is more suitable for deep-tissue multiphoton microscopy.
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Lam, Ping Koy. "Applications of Quantum Electro-Optic Control and Squeezed Light." Phd thesis, 1998. http://hdl.handle.net/1885/47657.
Full textAbstract:
In this thesis, we report the observations of optical squeezing from second harmonic generation (SHG), optical parametric oscillation (OPO) and optical parametric amplification (OPA). Demonstrations and proposals of applications involving the squeezed light and electro-optic control loops are presented. ¶ ...
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Nouroozi, Rahman [Verfasser]. "All optical wavelength conversion and parametric amplification in Ti: PPLN channel waveguides for telecommunication applications / von Rahman Nouroozi." 2010. http://d-nb.info/1010642960/34.
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Metzger, Thomas [Verfasser]. "High-repetition-rate picosecond pump laser based on an Yb:YAG disk amplifier for optical parametric amplification / von Thomas Metzger." 2009. http://d-nb.info/997270004/34.
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Antonosyan, Diana. "Non-Hermitian quantum and classical integrated nonlinear photonics." Phd thesis, 2016. http://hdl.handle.net/1885/110883.
Full textAbstract:
Integrated optical quantum circuits based on photonic waveguiding
structures are increasingly gaining attention as a possible
solution for scalable quantum technologies with important
applications to quantum simulations. Quantum communication
provides secure information transmission, but the distance over
which quantum states of light can be distributed without
significant disturbance is limited due to inescapable losses and
noise in optical elements. Loss is the greatest challenge facing
the implementation of integrated photonic technologies, and it is
inescapable in experimental reality.
In recent years there is a rise of interest in structures with
spatially inhomogeneous losses. Light propagation in waveguiding
structures with spatially distributed sections of loss can be
used for implementation of quantum plasmonic circuits, which are
able to strongly confine light to sub-wavelength dimensions, as
well as for parity-time (PT) symmetric structures, with phase
transition associated with PT-symmetry breaking, which opens new
possibilities for light manipulation.
The PhD thesis contains research on the controllable classical
and quantum dynamics of optical frequency conversion processes in
quadratically nonlinear photonic integrated circuites in the
presence of losses. Namely, I discuss spontaneous parametric
down-conversion (SPDC), sum-frequency generation (SFG) and
optical parametric amplification (OPA) in nonlinear structures
governed by non-Hermition Hamiltonians.
I explore the fundamental features of multi-photon generation in
integrated nonlinear waveguides. I have been shown that arrays of
coupled nonlinear waveguides can serve as a robust integrated
platform for the generation of entangled photon states with
nonclassical spatial correlations through spontaneous parametric
down-conversion (SPDC), and that the operation of such quantum
circuit is tolerant even to relatively high losses. Furthermore,
I have studied the bi-photon multimode quantum emission
tomography in waveguide structures with spatially inhomegeneous
losses. The PhD thesis also covers the research on the effect of
these losses in waveguide couplers possessing parity-time (PT)
symmetry. I have identified an anti-PT spectral symmetry of a
parametric amplifier based on those couplers. Finally, I
describe the single-photon conversion to a photon pair, and
identify opportunities for the efficient enhancement of this
process.
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Alves, Joana Andreia Casanova Ferreira. "Characterization of an OPCPA laser amplifier based on the nonlinear crystal YCOB." Master's thesis, 2015. http://hdl.handle.net/10362/15655.
Full textAbstract:
The work described in this thesis was performed at the Laboratory for Intense Lasers
(L2I) of Instituto Superior Técnico, University of Lisbon (IST-UL). Its main contribution
consists in the feasibility study of the broadband dispersive stages for an optical
parametric chirped pulse amplifier based on the nonlinear crystal yttrium calcium
oxi-borate (YCOB). In particular, the main goal of this work consisted in the characterization and implementation of the several optical devices involved in pulse expansion and compression of the amplified pulses to durations of the order of a few optical cycles (20 fs). This type of laser systems find application in fields such as medicine, telecommunications and machining, which require high energy, ultrashort (sub-100 fs) pulses.
The main challenges consisted in the preliminary study of the performance of the
broadband amplifier, which is essential for successfully handling pulses with bandwidths
exceeding 100 nm when amplified from the μJ to 20 mJ per pulse. In general, the
control, manipulation and characterization of optical phenomena on the scale of a few
tens of fs and powers that can reach the PW level are extremely difficult and challenging due to the complexity of the phenomena of radiation-matter interaction and their nonlinearities, observed at this time scale and power level.
For this purpose the main dispersive components were characterized in detail, specifically addressing the demonstration of pulse expansion and compression. The
tested bandwidths are narrower than the final ones, in order to confirm the parameters
of these elements and predict the performance for the broadband pulses. The work performed led to additional tasks such as a detailed characterization of laser oscillator seeding the laser chain and the detection and cancelling of additional sources of dispersion.