Дисертації з теми "Optical frequency stabilization"
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Ho, Diane Shan-Yuan. "Frequency stabilization of an optical FDM system." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14033.
Includes bibliographical references (leaves 58-59).
by Diane Shan-Yuan Ho.
M.S.
Rydberg, Olof. "Stabilization of an optical frequency comb to an external cavity." Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-93439.
Dawkins, 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.
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.
Department 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.
Döringshoff, Klaus. "Optical frequency references based on hyperfine transitions in molecular iodine." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19156.
This thesis deals with the development and investigation of optical absolute frequency references based on rovibronic transitions in molecular iodine. Doppler-free saturation spectroscopy methods are employed to resolve individual transitions of the hyperfine structure with linewidths below 1 MHz in the B-X system of molecular iodine at 532 nm with the second harmonic of Nd:YAG lasers. Electronic feedback control systems are employed for laser frequency stabilization to the line center of the optical transitions with a line splitting of 10^5. With the goal of a space qualified optical absolute frequency reference for future laser-interferometric space missions, two spectroscopy setups were designed and realized in quasi-monolithic, glass-ceramic setups as so called elegant bread board model and engineering model. These iodine references were characterized in detail with respect to their frequency stability and reproducibility and the engineering model was subject to environmental tests, including vibrations and thermal cycling to verify its applicability in future space missions. For the investigation of the frequency instability of these iodine references, a frequency stabilized laser system was realized based on a temperature controlled high Finesse ULE cavity for direct frequency comparisons at 1064 nm. Analysis of the frequency stability of the iodine references revealed exceptionally low fractional frequency instability of 6x10^−15 at 1 s, averaging down to less than 2×10^−15 at 100 s integration time, constituting the best reported stability achieved with iodine references to date. With the demonstrated performance, these absolute frequency references enable precision laser systems required for future space missions that are dedicated to, e.g., the detection of gravitational waves, mapping of the Earth’s gravitational field or precision test of fundamental physics.
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.
Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Foltynowicz, 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.
Möhle, Katharina. "Piezoelectrically tunable optical cavities for the gravitational wave detector LISA." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16745.
The Laser Interferometer Space Antenna (LISA) is a proposed space-based gravitational wave detector that aims to detect gravitational waves in the low frequency range from 0.1 mHz to 1 Hz, which is not accessible by ground-based detectors. It consists of three satellites whose distance is monitored by laser interferometry. The high frequency stability of the lasers required for this purpose is to be achieved with a three level noise reduction scheme. This includes a pre-stabilization stage that has to feature not only high stability but also tunability. One approach for such a tunable pre-stabilization is stabilizing a laser to an optical cavity with incorporated piezoelectric actuator. While this is not a new concept per se, it has never been realized with the required stability until now. Within this thesis, different types of piezo-tunable cavities have been built and thoroughly analyzed. It could be shown that the cavities fulfill all requirements for a tunable laser pre-stabilization for LISA. Furthermore, the work presented here gives a new insight into the potential of piezo-tunable cavities. Their performance is only one order of magnitude below that of the best non-tunable cavities of the same length and the measured noise can not be attributed to the integration of the piezo actuators. So, in principal, an even better performance should be achievable with piezo-tunable cavities. Indeed, theoretical considerations performed within this thesis reveal that the intrinsic stability of piezo-tunable cavities is only slightly inferior to that of rigid cavities. Beyond an application in LISA, highly stable piezo-tunable cavities are also valuable devices for numerous other applications. They can be used in cavity enhanced spectroscopy, as transfer cavities or as optical local oscillators in atomic and molecular spectroscopy.
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.
Capocasa, Eleonora. "Optical and noise studies for Advanced Virgo and filter cavities for quantum noise reduction in gravitational-wave interferometric detectors." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC080/document.
Gravitational wave astronomy has started in September 2015 with the first detection of a binary black-hole merger by LIGO. Since then, several black-hole mergers and a binary neutron star merger have been observed. Advanced Virgo joined the two LIGO detector in the observation run, in August 2017, highly increasing the localization capabilities of the network. In order to fully exploit the scientific potential of this new-born field, a huge experimental effort is needed to bring the instruments at their design sensitivity and to further improve them. This thesis, developed in this context, it is composed of two parts. The first is about Advanced Virgo: we have developed an automatic noise budget for the laser frequency noise and we have performed optical characterization measurements for the kilometric arm cavities. Round trip Losses as low as 80 ppm have been measured. They are among the lowest ever measured for beams of these size. The second part is about the design and development of a 300 m filter cavity, a prototype to demonstrate the frequency dependent squeezing production with properties needed for a broadband quantum noise reduction in the future upgrades of KAGRA, Advanced Virgo and Advanced LIGO. We have contributed to the design and integration phases of the project. We have first made the optical design of the cavity, including the the specifications for the main cavity optics and a detailed estimation of the squeezing degradation sources. We have then developed a local control system for the mirrors, assembled the suspensions, and finally aligned and brought the cavity in resonance with the laser light
Ly, Aliou. "Développement d’un oscillateur paramétrique optique continu intense et à faible bruit pour des applications aux communications quantiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS528/document.
Long distance quantum communications are limited to few tens of km due to the attenuation of light in telecom fibres. Quantum repeaters (quantum relays synchronized by photonic quantum memories) were introduced in order to increase distances. Or, currently, the most efficient memories do not operate at wavelengths in the telecom C band. In order to take advantage of these memories, the use of quantum interfaces (second order nonlinear medium) was proposed as an alternative. Thus, by adding by sum frequency generation a pump photon at an appropriate wavelength to the telecom photon carrying the information, one transfers the information to a wavelength compatible with these memories, and this with a preservation of the information initially carried by the telecom photon. Our aim is thus to build a continuous-wave singly resonant optical parametric oscillator (cw SRO) which will provide a wave at 1648 nm that will be frequency summed to telecom photons at 1536 nm to transfer the information to a photon storable into alkali atoms based memory. To efficiently transfer the information, the cw SRO has to fulfill some requirements: a high spectral purity (linewidth ~kHz), a high output power (~1 W) and a wavelength longer than that of the telecom photon to be converted. To this aim, we use the non-resonant wave of a cw SRO. The first work done during this thesis was to experimentally prove the possibility to have both high output power and high spectral purity from a cw SRO. By reusing a cw SRO already built during our previous works, we were able to stabilize at the kHz level the frequency of the non-resonant wave at 947 nm (signal wave) of this SRO, with an output power of more than one watt. Then, we built the cw SRO of which non-resonant wave at 1648 nm (idler wave) has been frequency stabilized below the kHz level along with an output power of the order of one watt. We next studied the long term stability of the idler wavelength at 1648 nm. We have measured frequency drifts of the order of 10 MHz/mn. These drifts originating mainly from the reference cavity to which the SRO is locked, can be reduced by, firstly, an active control of the cavity and by, secondly, the use of robust frequency stabilization techniques
Andrieux, Emeline. "Réalisation d’un oscillateur paramétrique optique stabilisé en fréquence et accordable continûment sur 500ghz pour la spectroscopie infrarouge." Thesis, Paris, CNAM, 2011. http://www.theses.fr/2011CNAM0796/document.
We developed a singly-resonant optical parametric oscillator (SRO) based on a nonlinear crystal of 5%-ppMgCLN congruent lithium niobate chip and pumped at 1064 nm by an extended cavity diode laser widely tuneable from 1050 to 1070 nm injecting a 10 W Yb-fiber amplifier. It generates an idler wave between 3 and 4 µm and a signal wave between 1450 and 1650 nm. The SRO cavity is stabilized to the top of a Fabry-Perot transmission fringe. We then demonstrated a mode-hop-free idler tuning range of 500 GHz. This broad continuous tunability could be used for multi-species high resolution spectroscopy in the mid-infrared. Moreover, we have revisited the plane waves SRO theory, whose analytical solutions were given for the first time in 1969 by Kreuzer in the form of a transcendental equation, using a very powerful perturbative method which takes into account the depletion of the pump. We were able to determine the input-output relations of SRO in the form of very simple explicit relationships, showing that the output powers are proportional to the cubic root of the pump power
Scott, G. "Optogalvanic frequency stabilization of hybrid TEA-COsub(2) lasers." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372097.
Sahni, Mohamed Omar. "Contribution à l'étude de techniques pour l'affinement spectral de lasers : application aux diodes à blocage de modes destinées aux télécommunications optiques cohérentes." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S121/document.
Optical frequency combs obtained from mode-locked laser diodes are potential candidates for WDM networks. However, their lines exhibit usually a broad optical linewidth ( 1-100 MHz). Thus their use is incompatible for high order modulation formats WDM based systems. This thesis investigates one solution to overcome this limitation. It consists of using a feed-forward heterodyne technique to reduce the frequency noise of each comb-line and consequently their optical linewidths. In a first approach, the technique is applied to a single-mode laser. This allowed us to validate its proper working and to identify the intrinsic limits of the experimental device set up. The latter analysis enabled us to reveal that the minimum achievable frequency noise level by our system, corresponds to a 50 Hz intrinsic optical linewidth spectrum and a 1,6 kHz optical linewidth based on 10 ms observation time. This technique is then applied to an actively mode-locked laser diode demonstrating, at our system output, a 21-line optical frequency comb with intrinsic optical linewidths reduced to below 7 kHz. It is worth noting that 9 among them, exhibit sub-kHz linewidths. For an observation time of 10 ms, all lines share the same optical linewidth, almost equal to 37 kHz. We thus show that the timing jitter impacts the technique performances. We also highlight the relevance of such coherence level for coherent optical communication. Lastly, we study a laser frequency pre-stabilization technique based on a locking to an unbalanced fiber interferometer. When applied to a single-mode laser, the technique showed a reduction of its technical frequency noise, thus leading to a clear improvement of its integrated optical linewidth from 224 kHz to 37 kHz for 3 ms observation time. This first result provides a good support towards the exploration of mode-locked laser diodes potential for metrological applications
Agaisse, Romain. "Auto-affinement spectral laser assisté par effet Brillouin." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENS091.
The frequency stability of lasers is a sought-after property in many fields such as optical communications, spectroscopy and time-frequency metrology. In this context, the Foton Institute has developed a principle making it possible to spectrally self-narrow a laser at extremely low levels. For this we pump a non-reciprocal Brillouin resonator which generates a spectrally pure Stokes wave. The addition of a phase-locked loop which counter-reacts to the pump then makes it possible to avoid mode hops of the Brillouin resonator while spectrally narrowing the pump laser, thus producing a cascaded self-narrowing effect. In this manuscript, we theoretically and experimentally study the Brillouin assisted laser spectral self-narrowing system. The modeling of all of its constituents using the formalism of transfer functions is supported by experimental validations. These transfer functions account for the response of the different elements of the system to phase and amplitude fluctuations. The expression of the transfer function of the complete system is then validated experimentally by comparing the theoretical predictions to the open-loop transfer function measurements as well as in step response. Exploitation of the model and its adjustable physical parameters then makes it possible to further reduce frequency fluctuations for a solid-state pump laser emitting at 1.54 μm. This allows us in particular to highlight the fact that the Brillouin resonator in these phase-locking conditions plays the role of an optical reference. The performance of the system is then evaluated by duplicating it and measuring the beat between the two independent systems in the microwave domain. Finally, the “buffer reservoir” principle is added to the spectral narrowing system. This principle based on the insertion of a non-linear absorption mechanism in the pump laser makes it possible to reduce excess amplitude noise at relaxation oscillations by 32 dB. This eliminates the main source of amplitude noise converted into phase noise in the system
Tran, Dang Bao An. "Widely tunable and SI-traceable frequency-comb-stabilised mid-infrared quantum cascade laser : application to high precision spectroscopic measurements of polyatomic molecules." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCD060.
The thesis consists in developing a high-resolution mid-infrared spectrometer traceable to primary frequency standards and providing a unique combination of resolution, tunability, detection sensitivity and frequency control. A quantum cascade laser (QCL) emitting at 10.3 µm is phase locked to an optical frequency comb stabilized to a remote 1.55 µm ultra-stable reference developed at LNE-SYRTE, monitored against primary frequency standards and transferred to LPL via an active noise compensated fibre link. This results in a 0.1 Hz QCL linewidth, a stability below 10⁻¹⁵ at 1 s and an uncertainty on its absolute frequency below 4 × 10⁻¹⁴. Moreover, the setup allows the QCL to be widely scanned over 1.4 GHz while maintaining the highest stabilities and precision. This QCL was used to carry out saturated absorption spectroscopy of several molecules in a compact multipass cell. We demonstrated statistical uncertaintyon line-center frequencies at the kHz level and sub-10 kHz systematic uncertainty. We have recorded several singular K-doublets and many rovibrational transitions of methanol, in particular weak transitions and weak doublets - unreported so far. Precise parameters modelling trioxaneh ave been determined with only a few tens of rovibrational transitions recorded at unprecedented accuracy. The quadrupole hyperfine structure of an ammonia transition has been resolved for thefirst time. This setup constitutes a key element for the project aiming at the first observation of parity violation in molecules currently held at LPL, and, more generally, for various fields of physics, from atmospheric and interstellar physics to fundamental physics beyond the standard model
Wu, 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.
Department 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.
Vanderbruggen, Thomas. "Détection non-destructive pour l’interférométrie atomique et Condensation de Bose-Einstein dans une cavité optique de haute finesse." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112067/document.
In this thesis, we study several methods to improve atom interferometers. In the first part of the manuscript, we analyze how a nondestructive detection, that preserves the coherence between the internal degrees of freedom in an atomic ensemble, can be used to increase the sensitivity of interferometers. We first theoretically show how the projection of the wave-function induced by the measurement prepares spin-squeezed states. We then present the implementation of this method with a detection based on the frequency modulation spectroscopy. Finally, some first applications are described, more explicitly we show how to implement a quantum feedback that preserve the atomic state against the decoherence induced by a random collective flip, we also introduce a phase-locked loop where the atomic sample is used as the phase reference. In the second part of the manuscript, we present the all-optical realization of a Bose-Einstein condensate in a high-finesse cavity using a laser system based on standard telecoms technologies. We first describe the resonator and the frequency lock of the laser on the resonance, in particular, we introduce a new stabilization method based of the serrodyne modulation. Finally, we show how the condensate is obtained from the evaporation in the cavity mode
Camy, Georges. "Sources laser ultrastables en spectroscopie de saturation : réalisation d'étalons optiques de fréquence et caractérisation de leurs qualités." Paris 13, 1985. http://www.theses.fr/1985PA132009.
Sebastian, Ananthu. "Noise dynamics in multi-Stokes Brillouin laser." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S068.
Stimulated Brillouin Scattering (SBS) is a coherent interaction process in which light is scattered from optically generated acoustic waves. It is a powerful tool for microwave and optical signal processing, distributed sensing and spectroscopy. Brillouin lasers are attracting a lot of interest for their ability to produce ultra coherent linewidths. This thesis is devoted to the understanding of noise properties of Brillouin fiber ring lasers, operating with multiple Stokes orders. First, we present a technique based on the cavity ring-down method, which allows to characterize the Brillouin gain coefficient directly from probing the laser cavity. Its advantages are to obtain parameters from a single experiment with low optical powers (some 10 milliwatts) for short cavities (a few meters long, or integrated cavities). Secondly, it is shown that an intrinsic linewidth of a few tens of mHz can be easily obtained by cascading two non-resonant Brillouin lasers (for which the pump performs a single pass inside the cavity). In order to obtain these results, the long-term stability has been improved by using a Pound-Drever-Hall servo loop, which allows us to compare our analytical and experimental results. Unfortunately, we were unable to explore the fundamental limits of noise reduction due to the noise floor of our bench. Thirdly, one of the major works of this thesis is the theoretical and experimental study of the noise properties, including frequency noise and relative intensity noise, of a resonant Brillouin laser (for which pump and Stokes waves are resonant inside the cavity). In particular, the impacts of the fiber-ring-cavity quality factor, Brillouin gain detuning, are evaluated very precisely on the laser RIN features such as amplitude noise reduction and relaxation frequency. We emphasize the fact that many characteristics of the frequency noise are related to the RIN properties by a coupling between intensity and phase. We show that the cascade process modifies the dynamics of the Brillouin laser when compared to those of a single-mode Brillouin laser with a single first-order Stokes component. Our experimental results are in excellent agreement with our numerical simulations, obtained thanks to our non-linear system describing the operation of a multi-Stokes Brillouin laser. This good match is mainly due to our ability: to obtain very precise values of the cavity parameters and the Brillouin gain coefficient using the CRDM technique ; to achieve long-term stability (hours); to finely control the detuning between the laser Stokes resonance and the frequency of the Brillouin gain maximum. We demonstrate experimentally for the first time that frequency noise is degraded in the presence of anti-Stokes Brillouin scattering. We also show that a gain detuning of the order of a few hundred kHz can degrade the intensity noise reduction or also increase the linewidth by amplitude-phase coupling. All these very fine observations thus allow us to set the fundamental limits of such laser systems such as: the increase in noise due to anti-Stokes orders; the role of pump noise and its possible interrelation with cavity finesse; the effect of the detuning inherent to higher Stokes orders. All these conclusions are key to the design and engineering of these Brillouin fiber lasers, which are currently attracting a great deal of interest as evidenced by the work in progress in the scientific community. This PhD thesis contributes to a better understanding of multi-Stokes Brillouin lasers
Abbas, Allaoua. "Développement d'un dispositif pompe-sonde hétérodyne : application à l'imagerie en acoustique picoseconde." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00988758.
Růžička, Bohdan. "Normál vlnové délky pro optické komunikace v pásmu C." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-233431.
Durand, Mathieu. "Maintien du couplage optique entre une ECDL et une cavité de haute finesse : application à la mesure ultrasensible de biréfringence induite par effet Kerr." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00432201.
Hallal, Ayman. "Génération d'ondes millimétriques et submillimétriques sur des systèmes fibrés à porteuses optiques stabilisées." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S005/document.
I report in this manuscript a theoretical and experimental study of a compact, reliable and low cost source of 30 Hz linewidth, continuous and coherent electromagnetic waves tunable from 1 GHz to 500 GHz in steps of 1 GHz. These waves are generated by photomixing two distributed feedback (DFB) laser diodes at 1550 nm which are frequency stabilized with orthogonal polarizations on the same optical fibered Fabry-Perot cavity. I have designed very fast electronic control filters for each laser allowing a 7 MHz servo bandwidth limited by the loop length. I demonstrate phase noise suppressions down to -60 dBc/Hz at 1 kHz and -90 dBc/Hz at 100 kHz offset frequencies from a 92 GHz electrical carrier. I also measure a ~170 kHz frequency drift of the beat note at 10 GHz on the long term over a continuous 7.5 hour locking period. I show an optimized design of an integrated servo loop of few tens of cm length which reduces the phase noise by 18 dB at 1 MHz optical carrier offset frequency and the phase-amplitude couplings in the cavity by a factor of 50 compared to the experimental one. The addition of a third DFB laser phase stabilized on a local oscillator allows the possibility to have continuously tunable source over 1 THz. The continuous wave source also makes it possible to generate fixed repetition rate pico- or femtosecond pulses from highly non-linear and dispersive fibers, replacing the DFB lasers by further stable lasers. I have calculated by simulation 7.2 fs temporal jitter at 40 GHz repetition rate over a 1 ms integration time
Kozelský, Adam. "Metody stabilizace frekvence polovodičových laserů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219356.
Bréant, Christian. "Développement de lasers infrarouges accordables de haute pureté spectrale : application à la spectroscopie hyperfine des molécules HF et SF(6)." Paris 13, 1985. http://www.theses.fr/1985PA132010.
Lin, Ming-Chih, and 林鳴志. "Study of Frequency Stabilization Using Birefringent Optical Cavity." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/14258099730749719800.
國立清華大學
物理學系
87
Mio developed the LASER frequency stabilization by using an optical cavity comprising birefringent mirrors, the defect is that birefringence of the cavity is inherent and unmodifiable. In our experiment, stress is exerted upon the cavity to modify birefringence of the cavity and we could upgrade the effect of LASER frequency stabilization by moderate stress. Hansch used the cavity that a polarizer placed inside to lock the frequency of a laser, but the polarizer degrade finesse of the cavity because of absorption and scattering. To avoid this trouble, the cavity that a polarizer placed inside is replaced by a birefringent cavity.
"Performance of phase noisy optical systems with frequency stabilization." Massachusetts Institute of Technology, Laboratory for Information and Decision Systems], 1991. http://hdl.handle.net/1721.1/3237.
Caption title. "Revised October 15, 1991."
Includes bibliographical references (p. 14-16).
Research supported by the National Science Foundation. NCR-8802991 Research supported by the U.S. Army Research Office. DAAL01-86-K-0171
Chen, Zai Mian, and 陳再勉. "Implementation of optical comb generator and its frequency stabilization." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/45089571971469976760.