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Kwee, Patrick. "Laser characterization and stabilization for precision interferometry". Hannover Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1000893626/34.
Pełny tekst źródłaPugla, Sarika. "Ultrastable high finesse cavities for laser frequency stabilization". Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490789.
Pełny tekst źródłaSievers, Charles A. (Charles Anders) 1979. "Frequency stabilization for a 486nm dye-ring laser". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32754.
Pełny tekst źródłaIncludes bibliographical references (p. 43).
For my thesis, I worked towards using two reference cavities to provide frequency stabilization to a 486nm dye-ring laser. After a doubling cavity doubles the frequency to 243nm, the laser beam is used to excite ground state hydrogen to the 2S state: the first step of an experiment to accurately measure the 2S-NS transitions of hydrogen and measure the Lamb shift and Rydberg's constant. Two stabilization cavities were used to prevent the frequency from drifting and to narrow the laser's line-width. I aligned the majority of the optics and coupling light into fiber-optic cables and Fabrey-Perot cavities. Coupling light into a high finesse Fabrey-Perot cavity requires matching the radius of curvature of constant phase of the laser with the geometry of the cavity. To do this, I first measured the physical properties of the laser beam and then numerical arrived at a solution using two lenses to match the conditions imposed by the cavity's geometry. I aligned the cavity and then observed a Pound-Drever-Hall error signal. This error signal will be fed back into the laser to stabilize the frequency. It is anticipated that when the electronics to utilize the error signals are completed, the laser frequency will be stabilized to a hundred hertz, an four order of magnitude improvement over the stability provided by the commericial laser.
by Charles A. Sievers.
S.B.
Abu-Taha, M. I. A. "Optoacoustic frequency stabilization of a carbon dioxide laser". Thesis, Keele University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377921.
Pełny tekst źródłaKwee, Patrick [Verfasser]. "Laser characterization and stabilization for precision interferometry / Patrick Kwee". Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1000893626/34.
Pełny tekst źródłaAhmed, H. H. I. S. "Frequency selection and stabilization of semiconductor laser diode systems". Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635861.
Pełny tekst źródłaCunado, Jose. "CONTROL AND STABILIZATION OF LASER PLASMASOURCES FOR EUV LITHOGRAPHY". Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2746.
Pełny tekst źródłaM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
Trad, Nery Marina [Verfasser]. "Laser power stabilization via radiation pressure / Marina Trad Nery". Hannover : Gottfried Wilhelm Leibniz Universität, 2021. http://d-nb.info/1234147564/34.
Pełny tekst źródłaByrne, Nicole (Nicole Malenie). "Phase stabilization of laser beams in a cold atom accelerometer". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/96460.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (pages 95-97).
A cold atom accelerometer measures the displacement of a proof mass of laser cooled atoms with respect to an instrument reference frame. The cold atom interferometer's reference frame is defined by a pair of specially prepared, counter-propagating laser beams, that measure inertially induced atom displacements with nm scale resolution. This corresponds to acceleration sensitivities comparable to state of the art electro-mechanical accelerometers. In dynamic environments, sensitivity is limited by the stability of the relative laser phase of the two interrogation laser beams, which is adversely affected by vibrations and temperature fluctuations of the interrogation beam optics. Without an independent measurement, the cold atom interferometer cannot distinguish platform acceleration from laser phase fluctuations, which thus are a potentially serious source of error. In this thesis, a Michelson optical interferometer and an optical feedback loop were used to stabilize the relative phase of the interrogation laser beams in a cold atom accelerometer. A digital controller stabilized the relative phase via an electro-optic phase modulator. This control loop's bandwidth encompasses 98.8% of the noise power as determined from the power spectral density of the open loop 795nm Michelson signal. Increasing the controller bandwidth would gain the system marginal improvement in noise reduction. At an atom interferometer dwell time of 1 msec, active laser phase stabilization improved the atom interferometer sensitivity; at an atom interferometer dwell time of 8msec, an improvement was no longer evident. Improvements to the laser phase stabilization system are proposed to increase atom interferometer stability at longer dwell times.
by Nicole Byrne.
S.M.
Chong, Michael. "Optical power stabilization of a laser diode for qnd measurement". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5892/.
Pełny tekst źródłaStacey, John-Patrick. "Stabilization and control in a linear ion trap". Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:5c019c02-c313-4fb4-92f4-8a342dd5dbf6.
Pełny tekst źródłaDrollinger, Cy Taylor. "Frequency stabilization of an external cavity diode laser employing digital control". Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/drollinger/DrollingerC0806.pdf.
Pełny tekst źródłaZhu, Feng. "Carrier envelope phase stabilization of a femtosecond laser and iodine spectroscopy". Texas A&M University, 2005. http://hdl.handle.net/1969.1/4274.
Pełny tekst źródłaHanke, Manuela Melanie [Verfasser]. "Laser frequency stabilization for the sub-SQL interferometer / Manuela Melanie Hanke". Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2018. http://d-nb.info/1170355609/34.
Pełny tekst źródłaBorchers, Bastian. "Pushing frontiers in Carrier-Envelope Phase stabilization of ultrashort laser pulses". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17137.
Pełny tekst źródłaThe present thesis is dedicated to improvements of the carrier-envelope phase stabilization of ultrashort laser pulses. In order to realize such improvements, the fundamental noise sources are identified, and suitable measures for their reduction are proposed. It is shown that both, the measurement of the carrier-envelope phase (CEP) as well as its control are corrupted by different noise contributions. On the one hand, the detection process is influenced by technical noise sources, which arise especially in the used nonlinear interferometers. On the other hand, the detection noise in the electro-optic conversion represents a fundamental limitation, since the optical shot noise as well as the noise induced by the light detector inevitably influence the measurement of the CEP. It is demonstrated how such limitations can be minimized by a suitable choice of the interferometer topology and by an optimization of the spectral broadening process in a micro-structured fiber. This way an enormous improvement of the signal-to-noise ratio by 20 dB is obtained experimentally, which significantly reduces the limitation of detection noise. For controlling the CEP of mode-locked oscillators, a novel double stabilization scheme is introduced in this thesis, which combines a feed-forward stabilization based on an acousto-optic frequency shifter, with a classical feedback loop. This method enables a reduction of the residual phase jitter to an unprecedented value of 20 milliradian. Beyond that, several further concepts are introduced that are capable of stabilizing the CEP without any feedback to the laser oscillator. One of these concepts, represents a pulsed feed-forward stabilization, which is specifically designed for the use in combination with a subsequent amplification stage. First experimental results indicate that residual phase jitters of less than 100 milliradian are within reach also for amplified laser systems.
Tröbs, Michael. "Laser development and stabilization for the spaceborne interferometric gravitational wave detector LISA". [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974983705.
Pełny tekst źródłaOppermann, Patrick [Verfasser]. "Characterization and stabilization of a high power fiber amplifier laser / Patrick Oppermann". Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1136882707/34.
Pełny tekst źródłaRollins, Jameson Graef 1976. "Intensity stabilization of a solid-state laser for interferometric gravitational wave detectors". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29368.
Pełny tekst źródłaIncludes bibliographical references (p. 69-71).
A high-power, low noise photo-detector, in conjunction with a current shunt actuator has been used in an AC-coupled servo to stabilize the intensity of a 10 Watt continuous-wave Nd:YAG laser. A relative intensity noise of 1 x 10⁻⁸ [square root] Hz at 10 Hz has been achieved.
by Jameson Graef Rollins.
S.M.
Moon, Eric Wayne. "Carrier-envelope phase stabilization of grating-based chirped-pulse amplifiers". Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1125.
Pełny tekst źródłaThorin, Emil. "Towards the carrier-envelope phase stabilization of a16 TW 4.5 fs laser system". Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152443.
Pełny tekst źródłaGuionie, Marie. "Lasers à fibres bifréquences bipolarisations : stabilisation et montée en fréquence du battement". Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S059.
Pełny tekst źródłaThis work is about dual-polarization dual-frequency fibers lasers. The control of the frequency difference of these lasers is a major challenge in microwave photonics. Controlling the beat frequency could allow compact and low-noise sources, in order to develop applications in metrology or telecom. Here, we focus on 1.5 μm sources, in either DFB or DBR configurations, made of Er-doped or co-doped Er:Yb silica fibres. Their beat frequency is about 1 GHz for DFB lasers, and 100 MHz for DBR lasers. This thesis investigates several methods to stabilize the beat note, then to modify the fiber birefringence, to increase the beat frequency. First, an optical phase-locked loop method is used to lock the beat note on a frequency reference. By using the pump diode as an actuator, we have successfully stabilized beat frequencies between 300 MHz and 10 GHz for days. We then study a stabilization method by frequency-shifted optical feedback. A theoretical model based on rate equations model is used and allows to retrieve the experimental observations. We observe different dynamical regimes by locking the beat note on a reference frequency. In the stable area, we reduce the phase noise to −100 dBc/Hz at 1 kHz from the carrier. Next, we have mixed the set-up of the injection-locking to a delay line, in order to effectively stabilize the beat note on itself. Finally, various approaches have been explored to increase the beat frequency of DBR lasers, to the needs of applications. It has been possible to continuously monitor the impact of a UV beam on the fiber birefringence. We also studied a method for reversible modification of the birefringence, exploiting the elasto-optical effect. Regardless of the method used, we observed an increase in the beat frequency from 100 MHz to more than 10 GHz in the best case
Quinlan, Franklyn. "LOW NOISE, HIGH REPETITION RATE SEMICONDUCTOR-BASED MODE-LOCKED LASERS FOR SIGNAL PROCESSING AND COHERENT COMMUNICATIONS". Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3393.
Pełny tekst źródłaPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Bouchard, Line. "Stabilization of an FM active harmonic mode-locked fiber laser at high repetition rates". Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27614.
Pełny tekst źródłaLally, Evan M. "A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34739.
Pełny tekst źródłaMaster of Science
Mandre, Shyam K. "Controlling the emission properties of high power semiconductor lasers stabilization by optical feedback and coherence control". Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2833481&prov=M&dok_var=1&dok_ext=htm.
Pełny tekst źródłaAyling, Neroli Kim. "Organometallics in the Stabilization of Dyed Fibres". Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/1693.
Pełny tekst źródłaEbadi, Hossein [Verfasser], i Christoph H. [Akademischer Betreuer] Keitel. "Stabilization and interference in high-frequency laser driven atoms / Hossein Ebadi ; Betreuer: Christoph H. Keitel". Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179228898/34.
Pełny tekst źródłaWu, Shun. "Direct fiber laser frequency comb stabilization via single tooth saturated absorption spectroscopy in hollow-core fiber". Diss., Kansas State University, 2014. http://hdl.handle.net/2097/18373.
Pełny tekst źródłaDepartment of Physics
Kristan L. Corwin
Portable frequency references are crucial for many practical on-site applications, for example, the Global Position System (GPS) navigation, optical communications, and remote sensing. Fiber laser optical frequency combs are a strong candidate for portable reference systems. However, the conventional way of locking the comb repetition rate, frep, to an RF reference leads to large multiplied RF instabilities in the optical frequency domain. By stabilizing a comb directly to an optical reference, the comb stability can potentially be enhanced by four orders of magnitude. The main goal of this thesis is to develop techniques for directly referencing optical frequency combs to optical references toward an all-fiber geometry. A big challenge for direct fiber comb spectroscopy is the low comb power. With an 89 MHz fiber ring laser, we are able to optically amplify a single comb tooth from nW to mW (by a factor of 10^6) by building multiple filtering and amplification stages, while preserving the comb signal-to-noise ratio. This amplified comb tooth is directly stabilized to an optical transition of acetylene at ~ 1539.4 nm via a saturated absorption technique, while the carrier-envelope offset frequency, f0, is locked to an RF reference. The comb stability is studied by comparing to a single wavelength (or CW) reference at 1532.8 nm. Our result shows a short term instability of 6 x10^(-12) at 100 ms gate time, which is over an order of magnitude better than that of a GPS-disciplined Rb clock. This implies that our optically-referenced comb is a suitable candidate for a high precision portable reference. In addition, the direct comb spectroscopy technique we have developed opens many new possibilities in precision spectroscopy for low power, low repetition rate fiber lasers. For single tooth isolation, a novel cross-VIPA (cross-virtually imaged phase array) spectrometer is proposed, with a high spectral resolution of 730 MHz based on our simulations. In addition, the noise dynamics for a free space Cr:forsterite-laser-based frequency comb are explored, to explain the significant f0 linewidth narrowing with knife insertion into the intracavity beam. A theoretical model is used to interpret this f0 narrowing phenomenon, but some unanswered questions still remain.
SANTAGATA, ROSA. "Sub-nanometer length metrology for ultra-stable ring laser gyroscopes". Doctoral thesis, Rosa Santagata, 2015. http://hdl.handle.net/11365/1004514.
Pełny tekst źródłaXavier, Pradip. "Investigation of flame stabilization mechanisms in a premixed combustor using a hot gas cavity-based flame holder". Thesis, Rouen, INSA, 2014. http://www.theses.fr/2014ISAM0016/document.
Pełny tekst źródłaThis thesis describes the investigation of an innovative trapped vortex combustor (TVC): this concept uses recirculating hot gas flow trapped in cavities to stabilize lean main flames. Based on a global investigation of an unstable operating condition, the scientific strategy aims to treat separately the different physical mechanisms. The inert flow structure is analyzed prior to leading a spatio-Temporal study on an unstable mode. This investigation aims to understand the flaine-Flow-Acoustic interactions in the combustor. Several mechanisms piloting combustion instabilities are highlighted, and recommandations are provided in order to suppress them. An a posteriori check validate the preponderance of these mechanisms, in particular with the determination of stability flaine diagrams
Ikram, Masroor. "Investigations in carbon dioxide laser stabilization and saturation spectroscopy using the Stark effect and acousto-optic modulation". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335729.
Pełny tekst źródłaPadgett, Miles John. "Techniques for ultra-high resolution saturation spectroscopy and laser stabilization in the 10#mu#m spectral region". Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305843.
Pełny tekst źródłaDawkins, Samuel T. "Sapphire room temperature optical frequency reference : design, construction and application". University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0200.
Pełny tekst źródłaParslow, David. "A study of intra-cavity optoacoustic signal generation in a CO2 waveguide laser and its application to frequency stabilization". Thesis, Keele University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358042.
Pełny tekst źródłaGrib, Stephen William. "LAMINAR AND TURBULENT STUDY OF COMBUSTION IN STRATIFIED ENVIRONMENTS USING LASER BASED MEASUREMENTS". UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/117.
Pełny tekst źródłaGolinelli, Anna. "Development of an original 10 kHz Ti : Sa regenerative cavity allowing 17 fs CEP stable 1 kHz TW-class amplification or wavelength tunability". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS018.
Pełny tekst źródłaThe last decade has seen a lot of progress in attosecond science or in strong field physics. Generating energetic, few-cycle laser pulses with stabilized Carrier-Envelope Phase at high repetition rate constitutes the first step to access the ultra-fast dynamics underlying the interaction of matter with intense, ultrashort coherent light source. The work of this thesis consists in globally improving the performances of a high repetition rate Ti:Sa laser system optimized for attosecond science. We present an original 10 kHz Ti:Sa CPA laser based on an newlydesigneddouble-crystal cavity for thermal lensing management. The amplifier delivers up to 5 W in narrow band mode (35 fs pulses), or 2.7 W in broad band mode, supporting 17 fs pulses after temporal compression. We demonstrate shot-to-shot CEP stabilization with a remaining noise of 210 mrad over three hours at the front-end output. In parallel to the short pulse duration operation mode, it is possible to use the front end in a wavelength tunability mode within a 80 nm range around 800 nm, with a resolution of 1 nm and 30 to 40 nm of bandwidth. We designed and demonstrated a complete water-cooled lens-less multipass amplifier using thermal lensing for modeadaptation boosting the pulse energy up to 10mJ at 1 kHz repetition rate (up to 10 W). The saturation regime of the amplifier ensures negligible variation (±3% peak to peak) of the output power for significant variation of the input power (±25% peak to peak) over the tunability range. The energy scalability of the front-end is demonstrated by coupling its output to cryogenically cooled amplifier, delivering 1 kHz, TW-class pulses at 17.5 fs and CEP stabilized with a residual noise of 350 mrad. A study of CEP noise sources in high dispersive module is also addressed, proposing a numerical approach based on a commercial ray-tracing software (Zemax) for predicting CEP fluctuation in grating based modules
Lamb, Thorsten [Verfasser], i ERNST [Akademischer Betreuer] BRINKMEYER. "Laser-to-RF phase detection with femtosecond precision for remote reference phase stabilization in particle accelerators / Thorsten Lamb ; Betreuer: Ernst Brinkmeyer". Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2017. http://d-nb.info/1133581595/34.
Pełny tekst źródłaBorchers, Bastian Verfasser], Thomas [Akademischer Betreuer] Elsässer, Kurt [Akademischer Betreuer] Busch i Franz X. [Akademischer Betreuer] [Kärtner. "Pushing frontiers in Carrier-Envelope Phase stabilization of ultrashort laser pulses / Bastian Borchers. Gutachter: Thomas Elsässer ; Kurt Busch ; Franz X. Kärtner". Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://d-nb.info/1067484930/34.
Pełny tekst źródłaBorchers, Bastian [Verfasser], Thomas Akademischer Betreuer] Elsässer, Kurt [Akademischer Betreuer] Busch i Franz X. [Akademischer Betreuer] [Kärtner. "Pushing frontiers in Carrier-Envelope Phase stabilization of ultrashort laser pulses / Bastian Borchers. Gutachter: Thomas Elsässer ; Kurt Busch ; Franz X. Kärtner". Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://nbn-resolving.de/urn:nbn:de:kobv:11-100226662.
Pełny tekst źródłaLamb, Thorsten [Verfasser], i Ernst [Akademischer Betreuer] Brinkmeyer. "Laser-to-RF phase detection with femtosecond precision for remote reference phase stabilization in particle accelerators / Thorsten Lamb ; Betreuer: Ernst Brinkmeyer". Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2017. http://d-nb.info/1133581595/34.
Pełny tekst źródłaSands, Brian L. "Characteristics and dynamics of a passively stabilized high power and narrow-bandwidth broad-area laser coupled to an external variable length cavity". Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1122662023.
Pełny tekst źródłaTitle from first page of PDF document. Document formatted into pages; contains [1], ix, 93 p. : ill. Includes bibliographical references (p. 88-93).
Schmidt, Florian. "Laser-based Absorption Spectrometry : Development of NICE-OHMS Towards Ultra-sensitive Trace Species Detection". Doctoral thesis, Umeå : Department of Physics, Umeå Univ, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1414.
Pełny tekst źródłaSoni, Abhishek. "Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552656922178471.
Pełny tekst źródłaFoltynowicz, Aleksandra. "Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry". Doctoral thesis, Umeå universitet, Institutionen för fysik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-22269.
Pełny tekst źródłaNatile, Michele. "High-repetition rate CEP-stable Yb-doped fiber amplifier for high harmonic generation". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS149.
Pełny tekst źródłaIn the last two decades, attosecond physics, based on the high harmonic generation (HHG) phenomenon, has allowed a better understanding of ultrafast dynamics in the microcosm. High-energy few-cycles carrier-envelope phase (CEP) stabilized sources are the main enabling tools for this physics. Recently, temporally compressed Ytterbium-doped fiber amplifiers have been successfully used as high XUV photon flux HHG drivers. CEP stabilization of these sources would ensure their full compatibility with attoscience. The thesis is devoted to the CEP stabilization of a high repetition rate Yb-doped fiber femtosecond source, for high XUV photon flux beamline applications. In the first part, we present the architecture of such a source at 100 kHz repetition rate delivering 30 microjoules 96 fs CEP-stable pulses. It constitutes a test bench for future energy-scaled few-cycle sources. The CEP stabilization is ensured in a hybrid architecture including a passively stabilized frontend followed by an actively stabilized power amplifier. A residual CEP noise <400 mrad is measured using various setups, including a shot-to-shot measurement over 1 s and a long-term stability over 1 h. In the second part, we discuss the design of a high flux HHG beamline optimized for a future generation of fiber-based driver at 13 nm for applications to coherent diffraction imaging
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.
Pełny tekst źródłaWhile 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
Turghun, Matniyaz. "Free-space NPR mode locked erbrium doped fiber laser based frequency comb for optical frequency measurement". Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18682.
Pełny tekst źródłaDepartment of Physics
Brian R. Washburn
This thesis reports our attempt towards achieving a phase stabilized free-space nonlinear polarization rotation (NPR) mode locked erbium doped fiber laser frequency comb system. Optical frequency combs generated by mode-locked femtosecond fiber lasers are vital tools for ultra-precision frequency metrology and molecular spectroscopy. However, the comb bandwidth and average output power become the two main limiting elements in the application of femtosecond optical frequency combs. We have specifically investigated the free-space mode locking dynamics of erbium-doped fiber (EDF) mode-locked ultrafast lasers via nonlinear polarization rotation (NPR) in the normal dispersion regime. To do so, we built a passively mode-locked fiber laser based on NPR with a repetition rate of 89 MHz producing an octave-spanning spectrum due to supercontinuum (SC) generation in highly nonlinear fiber (HNLF). Most significantly, we have achieved highly stable self-starting NPR mode-locked femtosecond fiber laser based frequency comb which has been running mode locked for the past one year without any need to redo the mode locking. By using the free-space NPR comb scheme, we have not only shortened the cavity length, but also have obtained 5 to 10 times higher output power (more than 30 mW at central wavelength of 1570 nm) and much broader spectral comb bandwidth (about 54 nm) compared to conventional all-fiber cavity structure with less than 1 mW average output power and only 10 nm spectral bandwidth. The pulse output from the NPR comb is amplified through a 1 m long EDF, then compressed by a length of anomalous dispersion fiber to a near transform limited pulse duration. The amplified transform limited pulse, with an average power of 180 mW and pulse duration of 70 fs, is used to generate a supercontinuum of 140 mW. SC generation via propagation in HNLF is optimized for specific polling period and heating temperature of PPLN crystal for SHG around 1030 nm. At last, we will also discuss the attempt of second harmonic generation (SHG) by quasi phase matching in the periodically polled lithium niobate (PPLN) crystal due to nonlinear effect corresponding to different polling period and heating temperature.
SILVA, Cícero Moezio da. "Travamento da freqüência de um diodo laser nas asas da ressonância de uma linha atômica". Universidade Federal de Campina Grande, 2013. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1947.
Pełny tekst źródłaMade available in DSpace on 2018-10-10T17:10:14Z (GMT). No. of bitstreams: 1 CICERO MOEZIO DA SILVA – DISSERTAÇÃO (PPGFísica) 2013.pdf: 1359216 bytes, checksum: 450c592c37b5fc9ef90ce40e270eaaae (MD5) Previous issue date: 2013-08-16
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Este trabalho reporta o desenvolvimento experimental de um sistema de travamento da frequência de um diodo laser nas asas de uma linha atômica. Como sinal de erro, utilizamos a transmissão por uma célula com janelas paralelas (contendo vapor de césio) para o travamento da frequência. Mostramos que o sinal de erro é estável durante 1 hora e meia. Este sinal contemos citações nas asas da ressonância que podem ser usadas para a estabilização da frequência. Travamos a frequência entre 1860 a 2817 MHz fora da ressonância e obtemos uma estabilidade de 30MHz. A técnica descrita não necessita de campo magnético ou de detecção sensível a polarização,que simplifi ca substancialmente em relação às técnicas existentes.
In this work we demonstrate the experimental development of a system of frequency- locking of a diode laser on the wings of an atomic line. As an error signal, we use the transmission through a cell with parallel windows (containing cesium vapor) for the frequency-locking. We show that the error signalis stable for one hour and a half and has oscillations in the wings of the resonance that can be used tostabilize the frequency. We locked the frequency between 1860-2817 MHz out of resonance and obtained a stability of 30MHz. The described technique does not require a magnetic field or polarization-sensitive detection, whichs impli es substantially over existing techniques.
Lyu, Jike. "Epitaxial Ferroelectric Thin Films on Si(001): strain tuning of BaTiO3 and stabilization of polar phase in Hf0.5Zr0.5O2". Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667989.
Pełny tekst źródłaHadef, Redjein. "Mesure du nombre de markstein pour une flamme de premelange plissee". Aix-Marseille 1, 1987. http://www.theses.fr/1987AIX11127.
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