Bibliografias temáticas / Phase-Locked lasers

Literatura científica selecionada sobre o tema "Phase-Locked lasers"

Autor: Grafiati

Publicado: 21 de setembro de 2024

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Artigos de revistas sobre o assunto "Phase-Locked lasers"

Zhao, Yang, Shaokai Wang, Wei Zhuang e Tianchu Li. "Raman-Laser System for Absolute Gravimeter Based On 87Rb Atom Interferometer". Photonics 7, n.º 2 (15 de maio de 2020): 32. http://dx.doi.org/10.3390/photonics7020032.

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The paper describes a Raman-laser system with high performance for an absolute gravimeter that was based on 87Rb atom interferometer. As our gravimeter is a part of the standard acceleration of gravity of China, the Raman lasers’ characteristics should be considered. This laser system includes two diode lasers. The master laser is frequency locked through the frequency-modulation (FM) spectroscopy technology. Its maximum frequency drift is better than 50 kHz in 11 h, which is measured by home-made optical frequency comb. The slave laser is phase locked to the master laser with a frequency difference of 6.8346 GHz while using an optical phase lock loop (OPLL). The phase noise is lower than −105 dBc/Hz at the Fourier frequency from 200 Hz to 42 kHz. It is limited by the measurement sensitivity of the signal source analyzer in low Fourier frequency. Furthermore, the power fluctuation of Raman lasers’ pulses is also suppressed by a fast power servo system. While using this servo system, Raman lasers’ pulses could be fast re-locked while its fast turning on again in the pulse sequence. The peak value fluctuation of the laser power pulses is decreased from 25% to 0.7%, which is improved over 35 times. This Raman-laser system can stably operate over 500 h, which is suited for long-term highly precise and accurate gravity measurements.

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Fortier, T. M., D. J. Jones, Jun Ye e S. T. Cundiff. "Highly phase stable mode-locked lasers". IEEE Journal of Selected Topics in Quantum Electronics 9, n.º 4 (julho de 2003): 1002–10. http://dx.doi.org/10.1109/jstqe.2003.819110.

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Cundiff, Steven T., e Jun Ye. "Phase stabilization of mode-locked lasers". Journal of Modern Optics 52, n.º 2-3 (20 de janeiro de 2005): 201–19. http://dx.doi.org/10.1080/09500340412331303252.

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Xu, Yunfei, Weijiang Li, Yu Ma, Quanyong Lu, Jinchuan Zhang, Shenqiang Zhai, Ning Zhuo et al. "Phase-locked single-mode terahertz quantum cascade lasers array". Journal of Semiconductors 45, n.º 6 (1 de junho de 2024): 062401. http://dx.doi.org/10.1088/1674-4926/23120010.

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Abstract We demonstrated a scheme of phase-locked terahertz quantum cascade lasers (THz QCLs) array, with a single-mode pulse power of 108 mW at 13 K. The device utilizes a Talbot cavity to achieve phase locking among five ridge lasers with first-order buried distributed feedback (DFB) grating, resulting in nearly five times amplification of the single-mode power. Due to the optimum length of Talbot cavity depends on wavelength, the combination of Talbot cavity with the DFB grating leads to better power amplification than the combination with multimode Fabry−Perot (F−P) cavities. The Talbot cavity facet reflects light back to the ridge array direction and achieves self-imaging in the array, enabling phase-locked operation of ridges. We set the spacing between adjacent elements to be 220 μm, much larger than the free-space wavelength, ensuring the operation of the fundamental supermode throughout the laser's dynamic range and obtaining a high-brightness far-field distribution. This scheme provides a new approach for enhancing the single-mode power of THz QCLs.

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Afkhamiardakani, Hanieh, e Jean-Claude Diels. "Mode-Locked Fiber Laser Sensors with Orthogonally Polarized Pulses Circulating in the Cavity". Sensors 23, n.º 5 (24 de fevereiro de 2023): 2531. http://dx.doi.org/10.3390/s23052531.

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Intracavity phase interferometry is a powerful phase sensing technique using two correlated, counter-propagating frequency combs (pulse trains) in mode-locked lasers. Generating dual frequency combs of the same repetition rate in fiber lasers is a new field with hitherto unanticipated challenges. The large intensity in the fiber core, coupled with the nonlinear index of glass, result in a cumulative nonlinear index on axis that dwarfs the signal to be measured. The large saturable gain changes in an unpredictable way the repetition rate of the laser impeding the creation of frequency combs with identical repetition rate. The huge amount of phase coupling between pulses crossing at the saturable absorber eliminates the small signal response (deadband). Although there have been prior observation of gyroscopic response in mode-locked ring lasers, to our knowledge this is the first time that orthogonally polarized pulses were used to successfully eliminate the deadband and obtain a beat note.

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Botez, Dan, e Donald E. Ackley. "Phase-locked arrays of semiconductor diode lasers". IEEE Circuits and Devices Magazine 2, n.º 1 (janeiro de 1986): 8–17. http://dx.doi.org/10.1109/mcd.1986.6311765.

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Goldobin, I. S., N. N. Evtikhiev, Andrei G. Plyavenek e S. D. Yakubovich. "Phase-locked integrated arrays of injection lasers". Soviet Journal of Quantum Electronics 19, n.º 10 (31 de outubro de 1989): 1261–84. http://dx.doi.org/10.1070/qe1989v019n10abeh009137.

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Drummond, P. D., J. D. Harvey, J. M. Dudley, D. B. Hirst e S. J. Carter. "Phase Waves in Mode-Locked Superfluorescent Lasers". Physical Review Letters 78, n.º 5 (3 de fevereiro de 1997): 836–39. http://dx.doi.org/10.1103/physrevlett.78.836.

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Salzman, J., e A. Yariv. "Phase‐locked arrays of unstable resonator semiconductor lasers". Applied Physics Letters 49, n.º 8 (25 de agosto de 1986): 440–42. http://dx.doi.org/10.1063/1.97108.

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Khalatpour, Ali, John L. Reno e Qing Hu. "Phase-locked photonic wire lasers by π coupling". Nature Photonics 13, n.º 1 (10 de dezembro de 2018): 47–53. http://dx.doi.org/10.1038/s41566-018-0307-0.

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Mais fontes

Teses / dissertações sobre o assunto "Phase-Locked lasers"

Boyd, Richard L. (Richard Lyman). "An optical phase locked loop for semiconductor lasers". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/35943.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
Title as it appeared in MIT Graduate list, June, 1988: An optical phase locked loop.
Includes bibliographical references.
by Richard L. Boyd.
M.S.

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Avramopoulos, Hercules. "Phase effects in dispersion compensated passively mode-locked lasers". Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47342.

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Stolarz, Piotr Michal. "Development of a phase-sensitive pulse measurement technique for semiconductor mode-locked lasers". Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3368/.

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The ultrashort pulses emitted by passive semiconductor mode-locked lasers (PSMLLs) can be applied to a wide range of applications, including modern optical communication systems, optical sampling, security, imaging or sensing. For most of these applications, it is of critical importance to gather detailed information on the mode-locked laser (MLL) dynamics as well as on the temporal intensity and phase profiles of the pulses. The pulse formation in a PSMLL is in fact a very complex mechanism that is governed by the close interplay between a number of linear and nonlinear phenomena, influenced by various semiconductor parameters. The complete characterisation of the devices as a function of the laser driving parameters, geometry and semiconductor material structure has therefore the potential to provide a deeper understanding of the PSMLL behaviour. As the available detectors are usually incapable of resolving the temporal structures of ultrashort pulses from the high repetition rate MLLs, a number of indirect measurement solutions have been developed for full pulse characterisation. However, these methods are designed for lasers with high-energy optical pulses or require pulse synchronisation or ultrafast modulation. This obviously restricts their suitability for the unsynchronised, low energy and high repetition rate pulses as those emitted by the mode-locked laser diodes. In this work, an extensive study of various dynamical regimes, such as mode-locking, self-pulsation and continuous-wave operations of the monolithically integrated AlGaInAs/InP MLLs is reported. The devices operate around 1.55 µm and emit optical pulses with sub-40 GHz repetition frequencies. The influence of the biasing conditions, laser geometry and semiconductor material on the lasers performance is analysed in detail. The complete characterisation includes the evaluation of both the phase and time profiles of pulses, using a sonogram system developed as part of this thesis. It is based on a self-referenced method, capable of ambiguity-free measurements of low power and sub-picosecond pulses. A sensitivity as low as 5mW on the pulse peak power has been achieved through the design and fabrication of a two-photon absorption (TPA) detector, optimised for polarisation insensitivity and high nonlinear response. The travelling-wave operation enables the characterisation of high-repetition rate pulses and minimises the amount of introduced dispersion. The sonogram system has been successfully employed to study the evolution of the temporal intensity and group delay profiles as a function of the laser biasing conditions and for different device geometries. The obtained results indicate a prevailing positive chirp present in the pulses, which can be reduced by a careful adjustment of the device biasing. The minimum pulse width emitted from the investigated MLLs and measured with the sonogram technique was ~500 fs.

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Ozharar, Sarper. "Stable optical frequency comb generation and applications in arbitrary waveform generation, signal processing and optical data mining". Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002388.

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Auroux, Vincent. "Application des lasers fibrés à verrouillage de modes à la génération très haute fréquence à haute pureté spectrale". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30103/document.

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Le développement technologique dans le domaine des télécommunications, ainsi que des systèmes de détection, a accru ces dernières années la nécessité de signaux de référence présentant une très haute pureté spectrale. L'augmentation des débits, la saturation des bandes de fréquence ainsi que les performances imposées pour la détection radar ont ouvert la voie à la génération micro-onde par l'optique. Ces références de fréquence sont souvent issues d'oscillateurs optoélectroniques (OEO). Ces oscillateurs intègrent un élément de stockage de l'énergie au travers de résonateurs ou de longues lignes à retard fibrées afin d'augmenter leur facteur qualité et permettant ainsi d'atteindre des performances supérieures aux signaux multipliés à partir de sources basses fréquences ou directement à partir d'oscillateurs micro-ondes à résonateur diélectrique (DRO). Une topologie originale d'oscillateurs optoélectroniques a été proposée à la fin des années 1990 par une équipe américaine : il s'agit de remplacer le résonateur passif nécessitant un verrouillage du laser sur ce dernier par un résonateur actif, intégrant un amplificateur optique. Ce résonateur actif, un laser à blocage de modes, permet un couplage entre l'oscillation optique du laser et l'oscillation optoélectronique. On parle alors d'oscillateur optoélectronique couplé (COEO). Les performances du COEO sont étroitement liées à la pureté spectrale du signal issu du laser à blocage de modes. Ce travail de thèse traite de l'étude et de l'optimisation de ces systèmes. Une étude approfondie sur le bruit dans les amplificateurs optiques a tout d'abord été menée afin de déterminer quel type d'amplificateur choisir pour le COEO et sous quelles conditions l'amplification optique apporte un bruit de phase minimal. Ensuite, un COEO à 10 GHz a été réalisé, présentant un très faible bruit de phase atteignant - 132 dBc/Hz à 10 kHz de la porteuse. Un modèle a par ailleurs été implémenté, permettant de déterminer a posteriori l'efficacité du couplage et ainsi la bande de verrouillage entre l'oscillation optoélectronique et le laser à blocage de modes. Ce couplage interne dépend fortement de la dynamique du système. Cependant, les différents effets non linéaires qui ont lieu dans l'amplificateur à semiconducteur et les fibres ne permettent pas d'obtenir un modèle analytique. Un modèle itératif a alors été proposé afin d'obtenir les propriétés de l'enveloppe complexe lentement variable du peigne de fréquence généré en sortie du laser dont la photodétection conduit à la puissance RF générée par le COEO. Le COEO génère un peigne de fréquence suffisamment large pour produire des harmoniques RF supérieurs à la fréquence de répétition du laser à blocage de modes, si les modes longitudinaux espacés de plusieurs intervalles spectraux libres (ISL) sont en phase. Le modèle itératif développé permet, à partir des paramètres expérimentaux de déterminer le spectre optique ainsi que la distribution de phase à l'intérieur de celui-ci. Il est possible alors d'augmenter la puissance d'une harmonique en sortie de la photodiode par un ajout d'éléments dispersifs. Cette multiplication de fréquence permet la génération de signaux à haute pureté spectrale en bande millimétrique. Une démonstration expérimentale à 90 GHz a été proposée, basée sur un COEO fonctionnant à 30 GHz. Ces résultats sont prometteurs et une intégration du COEO dans un boîtier thermalisé ainsi qu'une gestion plus fine de la dispersion des fibres peut permettre des améliorations significatives sur le bruit de phase du système
The important rise of telecommunication systems in the past decades, together with the sensitivity improvement of radar systems, has increased the necessity for high spectral purity frequency references at high frequencies. The saturation of classical microwave bandwidths motivated the search of frequency references at higher frequencies, such as K-band. Frequency multiplication from highly stable sources, such as quartz sources, is limited by the increase of the noise floor, which is often prohibitive at millimeter wave frequencies. On the contrary, microwave generation using optics becomes a very efficient technique in this frequency range. Indeed, passive optical resonators or delay lines feature a high Q factor which can be used to stabilize the microwave frequency. The best phase noise performance is today obtained with long delay line oscillators. However, a spurious mode suppression technique has to be implemented in this type of OEOs. The use of an active optical resonator is a third solution, which avoids any locking technique between the laser and the passive resonator. The first architecture of this type has been proposed at the end of the 1990's. In such a system, a mode-locked laser is coupled to a microwave oscillator (COEO). COEO phase noise performances are strongly dependent on the spectral purity of the mode locked laser signal. This thesis work focus on the study and the optimization of this system. Optical amplifiers noise is firstly investigated, in order to determine the optimal conditions to minimize their phase noise contribution to the COEO. A 10 GHz SOA based COEO has been realized and features a low phase noise level reaching - 132 dBc/Hz at 10 kHz from the carrier. An analytical model has also been developed to obtain the locking range of the coupled oscillations. This frequency range is strongly dependent on the coupling efficiency between optical oscillation and the optoelectronic oscillation. This parameter cannot be calculated analytically and an iterative model has been proposed to determine the amplitude and phase of the optical spectrum. Therefore, one can calculate the RF power on the photodiode, on which the coupling efficiency is depending. Since COEO features a large optical frequency comb where each tooth of the comb is phase locked thanks to the mode locked laser, harmonic generation from COEO is possible. Wide frequency comb from high frequency COEO allow millimeter wave generation. The iterative model developed in this work enable to determine the RF power of one specified harmonic from experimental parameters. Harmonic selection can also be performed through the management of the chromatic dispersion. Such frequency multiplication has been implemented to generate a high purity 90 GHz signal from a 30 GHz COEO.These results are promising and an integration of the system in a thermalized box is under process

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Hoghooghi, Nazanin. "Injection-locked semiconductor lasers for realization of novel RF photonics components". Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5303.

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This dissertation details the work has been done on a novel resonant cavity linear interferometric modulator and a direct phase detector with channel filtering capability using injection-locked semiconductor lasers for applications in RF photonics. First, examples of optical systems whose performance can be greatly enhanced by using a linear intensity modulator are presented and existing linearized modulator designs are reviewed. The novel linear interferometric optical intensity modulator based on an injection-locked laser as an arcsine phase modulator is introduced and followed by numerical simulations of the phase and amplitude response of an injection-locked semiconductor laser. The numerical model is then extended to study the effects of the injection ratio, nonlinear cavity response, depth of phase and amplitude modulation on the spur-free dynamic range of a semiconductor resonant cavity linear modulator. Experimental results of the performance of the linear modulator implemented with a multi-mode Fabry-Perot semiconductor laser as the resonant cavity are shown and compared with the theoretical model. The modulator performance using a vertical cavity surface emitting laser as the resonant cavity is investigated as well. Very low V? in the order of 1 mV, multi-gigahertz bandwidth (-10 dB bandwidth of 5 GHz) and a spur-free dynamic range of 120 dB.Hz2/3 were measured directly after the modulator. The performance of the modulator in an analog link is experimentally investigated and the results show no degradation of the modulator linearity after a 1 km of SMF. The focus of the work then shifts to applications of an injection-locked semiconductor laser as a direct phase detector and channel filter. This phase detection technique does not require a local oscillator. Experimental results showing the detection and channel filtering capability of an injection-locked semiconductor diode laser in a three channel system are shown. The detected electrical signal has a signal-to-noise ratio better than 60 dB/Hz. In chapter 4, the phase noise added by an injection-locked vertical cavity surface emitting laser is studied using a self-heterodyne technique. The results show the dependency of the added phase noise on the injection ratio and detuning frequency. The final chapter outlines the future works on the linear interferometric intensity modulator including integration of the modulator on a semiconductor chip and the design of the modulator for input pulsed light.
ID: 031001383; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Title from PDF title page (viewed May 22, 2013).; Adviser: Peter J. Delfyett, Jr.; Thesis (Ph.D.)--University of Central Florida, 2012.; Includes bibliographical references (p. 106-110).
Ph.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics

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Sun, Yifan. "Theory of mode-locked lasers based on non-conventional cavity modes". Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP003.

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Cette thèse de doctorat porte principalement sur la dynamique et la robustesse d’un nouveau concept de verrouillage de mode dans les nanolasers semi-conducteurs ultracompacts. Un tel nanolaser présente des modes ermites-gaussiens créés par une cavité photonique harmonique pour confiner la lumière. Cela permet de mapper la cavité optique en oscillateur harmonique de mécanique quantique, avec des fréquences propres régulièrement espacées, une condition essentielle pour le verrouillage de mode. La période de verrouillage de mode est contrôlée par la conception du potentiel photonique, et non par la longueur de la cavité. Les régimes non linéaires possibles sont décrits par l’équation de Gross-Pitaevskii avec un potentiel parabolique et des termes non linéaires décrivant le gain et l’absorption. Pour étudier ces comportements dynamiques, des simulations numériques directes sont principalement mises en œuvre. Tout d’abord, la compétition de mode pour le gain entre les modes ermites et gaussiens en l’absence d’absorption saturable est étudiée. Deuxièmement, on prévoit que le verrouillage des modes se produira avec une saturation instantanée du gain et de l’absorption sur un large éventail de paramètres, correspondant à l’émergence d’une soliton dissipative. Troisièmement, dans le régime de saturation non instantanée du gain et de l’absorption, différents comportements dynamiques du nanolaser sont obtenus en faisant varier le gain et l’absorption. Ces différents régimes, y compris la commutation Q, le verrouillage de mode à commutation Q et le verrouillage de mode CW, sont décrits en détail. L’influence du facteur Henry sur le verrouillage de mode est également abordée. Quatrièmement, la robustesse du verrouillage de mode des modes ermite et gaussien au désordre de la cavité harmonique est étudiée en détail, y compris l’effet de la non-parabolicité du potentiel et les erreurs aléatoires dans la forme du potentiel
This PhD thesis mainly addresses the dynamics and the robustness of a novel concept of mode locking in ultracompact semiconductor nanolasers. Such a nanolaser exhibits Hermite-Gaussian modes created by a harmonic photonic cavity to confine light. This maps the optical cavity into quantum mechanical harmonic oscillator, with evenly spaced eigenfrequencies, an essential requirement for mode locking. The possible nonlinear regimes are described by the Gross-Pitaevskii equation with a parabolic potential and nonlinear terms describing gain and absorption. To investigate these dynamical behaviors, direct numerical simulations are mainly implemented. Continuation calculations are also performed using pde2path.First, the mode competition for gain among Hermite-Gaussian modes in the absence of saturable absorption is investigated and shown to be very different from usual resonators.Second, mode locking is predicted to occur with instantaneous saturation of gain and absorption over a broad range of parameters, corresponding to the emergence of dissipative soliton and multisoliton solutions. The mode locking period is controlled by the design of the photonic potential, and not by the cavity length. The dissipative soliton is well described by the coherent state of a quantum mechanical oscillator, namely a Gaussian envelope oscillating without deformation.Third, in the regime of noninstantaneous gain and absorption saturation, different dynamical behaviors of the nanolaser are obtained by varying the gain and the absorption. These different regimes, including Q-switching, Q-switched mode locking, and CW mode locking, are described in detail, illustrating the rich physics of this nonlinear system. The influence of the Henry factor on the mode locking is also discussed. Moreover, similar dynamical behaviors using spatially separated gain and absorber sections inside the cavity are obtained.Fourth, the robustness of mode locking of the Hermite-Gaussian modes to the disorder of the harmonic cavity is investigated in details. It includes the effect of non-parabolicity of the potential and the random errors in the shape of the potential

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Karuseichyk, Sopfy. "Noise in coupled VECSEL array". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS162.

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Les réseaux de lasers sont des composants clés dans de nombreux domaines de la science, de la technologie et des applications civiles aujourd'hui. Un domaine remarquablement nouveau d'application des réseaux de lasers est le solveur laser, qui permet de paralléliser le processus de calcul spatialement. Pour de telles applications, un réseau de lasers à faible bruit ayant des caractéristiques identiques est nécessaire. En même temps, la plupart des applications répertoriées nécessitent un mécanisme de couplage entre les lasers du réseau. Les lasers à état solide sont les plus couramment utilisés aujourd'hui pour de telles applications.Cependant, dans ce travail, nous présentons un nouveau type de réseau laser basé sur les VECSEL (Lasers à Émission de Surface à Cavité Externe Verticale) avec un contrôle de couplage intra-cavité. De tels lasers sont bien connus pour être des lasers à très faible bruit. Leurs dynamiques sont un exemple remarquable de comportement dynamique de classe A. Ces dynamiques s'accompagnent d'un filtrage du transfert du bruit de pompage au-dessus de la fréquence de coupure de la cavité. En même temps, le VECSEL est un laser à semi-conducteur, ce qui le distingue des lasers à état solide. Par exemple, il présente un facteur de Henry non négligeable. Les dynamiques de ces réseaux de VECSEL verrouillés en phase n'ont pas encore été étudiées.Ce laser est développé à partir d'une cavité plan-plan spatialement dégénérée. Grâce à la dégénérescence de la cavité, nous avons transformé un VECSEL multimode en un réseau de lasers indépendants avec un masque de perte spécialement conçu dans ce but. Nous avons atteint un contrôle sur le couplage entre les lasers dû à la diffraction sur le masque. Le couplage est déterminé par la diffraction sur les bords des trous du masque et la réflexion consécutive sur le miroir de sortie de la cavité. Les champs réfléchis de chaque laser sont injectés dans les trous voisins. Ce couplage est complexe. Nous le quantifions numériquement, puis développons plusieurs modèles pour la description de la dynamique du réseau laser en tenant compte de la complexité du coefficient de couplage. Chaque modèle caractérise l'une des topologies de masque étudiées. Nous avons montré expérimentalement que changer la position du masque permet de changer le couplage entre les lasers de zéro à des valeurs suffisantes pour verrouiller en phase le réseau de lasers. Nous avons effectué une mesure du bruit à la fois pour les solutions non verrouillées et verrouillées en phase. Les spectres de bruit relatif en intensité mesurés des lasers individuels ont confirmé la dynamique de classe A du réseau de VECSEL développé. Sur la base de la corrélation croisée des bruits des différents lasers, nous avons découvert une corrélation claire entre le verrouillage en phase et une corrélation spectrale du bruit. Ensuite, nous avons montré numériquement et analytiquement les mêmes phénomènes basés sur les modèles développés.Un intérêt particulier du projet concernait le réseau laser annulaire. De tels réseaux sont connus pour générer des solutions sous forme de série discrète de différences de phase lorsqu'ils sont verrouillés en phase. Nous avons étudié de telles solutions dans notre système. Chacune d'elles, à l'exception du verrouillage en phase, correspond à un vortex avec un incrément de phase discret entre les lasers. Nous avons étudié les limitations dictées par le facteur de Henry et dérivé une formule analytique générale. Nous avons étudié la génération de vortex asymétrique avec des masques de pertes non uniformes. De plus, nous avons étudié théoriquement l'influence de la rétroaction optique sur le verrouillage de phase dans un vortex. Le modèle de bruit d'un tel réseau a été confirmé expérimentalement avec trois lasers. Sur la base du modèle, nous avons trouvé une méthode simple pour déterminer le signe du vortex (direction de l'accumulation de phase) basée sur les mesures de bruit des lasers
Laser arrays are key components in many areas of science, technology, and civilian applications today. A remarkably new domain of application of laser arrays is the laser solver, which allows to parallelize the computation process spatially. For such applications a low noise array with identical laser's characteristics is required. At the same time, most of the listed applications require a coupling mechanism for the array. Most commonly, solid-state lasers are used today for such applications.However, in this work we present a new type of laser array based on the VECSEL (Vertical External Cavity Surface Emitting Lasers) with the intracavity coupling control. Such lasers are well known to be extremely low noise lasers. Their dynamics are a remarkable example of class-A dynamical behavior. Such dynamics is accompanied with the filtering of the transferred pump noise above the cavity cut-off frequency. At the same time the VECSEL is a semiconductor laser, which has distinguishing peculiarities, when compared with the solid-state laser. For example, it has a non-negligible Henry factor. Dynamics of such phase locked VECSEL arrays has not been studied yet.This laser is developed with a planar spatially degenerate cavity. Thanks to cavity degeneracy we transform a multimode VECSEL into an array of independent lasers with a designed loss mask. Thanks to the method of array development with a mask, we gain control on the coupling between lasers by the diffraction on the mask. The coupling is determined by the diffraction on the edges of the mask holes and consequent reflection on the output cavity mirror. Reflected field of each laser is injected to the neighboring holes. The coupling coefficient is complex. We numerically quantify it and then develop several models for the laser array dynamics description with considered complexity of the coupling coefficient. Each model characterizes one of the investigated mask topologies.Changes of the mask position were shown experimentally to change the coupling between lasers from zero to values large enough to phase-lock the laser array. We performed a noise measurement both for the unlocked and phase-locked solutions. The measured relative intensity noise spectra of individual lasers confirmed the class-A dynamics of the developed VECSEL array. Based on the cross-correlation on the noises of different lasers we discovered a clear correlation between phase-locking and a noises spectral correlation. Then, we could reproduce numerically and analytically the same results based on the models we developed.A particular interest of the project was situated on a ring laser array. Such arrays are known for their discrete series for the phase-difference solutions when phase-locked. We studied such solutions in our system. Each of them, except for the in-phase phase-locking, corresponds to a vortex with discrete phase increment between lasers. Since good quality vortices are extremely needed for particle micromotoring, information transfer, etc. we deeply studied such solutions in our system. We studied the limitations dictated by the Henry factor and derived a general analytical criterion for the existence of such solutions. We studied asymmetric vortex generation with non-uniform loss masks. Additionally, we studied theoretically the influence of optical feedback on the phase -locking in such a vortex. The noise model of such an array was experimentally confirmed with three lasers. Based on the model we found a simple method of the determination of the vortex sign (direction of the phase accumulation) based on the laser's noise measurements

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Kassa, Wosen Eshetu. "Modélisation électrique de laser semi-conducteurs pour les communications à haut débit de données". Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1016/document.

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Cette distinction est également valable pour le genre des individus (homme/femme). L'étude menée a montré que l'approche utilisant l'information spectrale des contours des phalanges permet une identification par seulement trois phalanges, à un taux EER (Equal Error Rate) inférieur à 0.24 %. Par ailleurs, il a été constaté « de manière surprenante » que la technique fondée sur les rapports de vraisemblance entre les phalanges permet d'atteindre un taux d'identification de 100 % et un taux d'EER de 0.37 %, avec une seule phalange. Hormis l'aspect identification/authentification, notre étude s'est penchée sur l'optimisation de la dose de rayonnement permettant une identification saine des individus. Ainsi, il a été démontré qu'il était possible d'acquérir plus de 12500/an d'images radiographiques de la main, sans pour autant dépasser le seuil administratif de 0.25 mSvL'avancement de la communication numérique optique dans les réseaux longue distance et d'accès a déclenché les technologies émergentes dans le domaine micro-ondes / ondes millimétriques. Ces systèmes hybrides sont fortement influencés non seulement par les déficiences de liens optiques mais aussi des effets de circuits électriques. Les effets optiques et électriques peuvent être ainsi étudiés en même temps en utilisant des outils assistés par ordinateur en développant des modèles de circuit équivalent de l'ensemble des composants de liaison tels que les lasers à semi-conducteurs, modulateurs, photo-détecteurs et fibre optique. Dans cette thèse, les représentations de circuit des composants de liaison photoniques sont développées pour étudier des architectures différentes. Depuis la source de lumière optique est le principal facteur limitant de la liaison optique, une attention particulière est accordée aux caractéristiques, y compris les plus importants de simples lasers en mode semi-conducteurs. Le modèle de circuit équivalent de laser qui représente l'enveloppe du signal optique est modifié pour inclure les propriétés de bruit de phase du laser. Cette modification est particulièrement nécessaire d'étudier les systèmes où le bruit de phase optique est important. Ces systèmes comprennent des systèmes de télécommande hétérodynes optiques et des systèmes auto-hétérodynes optiques. Les résultats de mesure des caractéristiques de laser sont comparés aux résultats de simulation afin de valider le modèle de circuit équivalent dans des conditions différentes. Il est démontré que le modèle de circuit équivalent peut prédire avec précision les comportements des composants pour les simulations au niveau du système. Pour démontrer la capacité du modèle de circuit équivalent de la liaison photonique pour analyser les systèmes micro-ondes / ondes millimétriques, le nouveau modèle de circuit du laser avec les modèles comportementaux des autres composants sont utilisés pour caractériser différents radio sur fibre (RoF) liens tels que la modulation d'intensité - détection directe (IM-DD) et les systèmes RoF hétérodynes optique. Signal sans fil avec des spécifications conformes à la norme de IEEE 802.15.3c pour la bande de fréquence à ondes millimétriques est transmis sur les liens RoF. La performance du système est analysée sur la base de l'évaluation de l'EVM. L'analyse montre que l'analyse efficace des systèmes de photonique micro-ondes / ondes millimétriques est obtenue en utilisant des modèles de circuit qui nous permet de prendre en compte les comportements à la fois électriques et optiques en même temps
The advancement of digital optical communication in the long-haul and access networks has triggered emerging technologies in the microwave/millimeter-wave domain. These hybrid systems are highly influenced not only by the optical link impairments but also electrical circuit effects. The optical and electrical effects can be well studied at the same time using computer aided tools by developing equivalent circuit models of the whole link components such as semiconductor lasers, modulators, photo detectors and optical fiber. In this thesis, circuit representations of the photonic link components are developed to study different architectures. Since the optical light source is the main limiting factor of the optical link, particular attention is given to including the most important characteristics of single mode semiconductor lasers. The laser equivalent circuit model which represents the envelope of the optical signal is modified to include the laser phase noise properties. This modification is particularly necessary to study systems where the optical phase noise is important. Such systems include optical remote heterodyne systems and optical self-heterodyne systems. Measurement results of the laser characteristics are compared with simulation results in order to validate the equivalent circuit model under different conditions. It is shown that the equivalent circuit model can precisely predict the component behaviors for system level simulations. To demonstrate the capability of the equivalent circuit model of the photonic link to analyze microwave/millimeter-wave systems, the new circuit model of the laser along with the behavioral models of other components are used to characterize different radio-over-fiber (RoF) links such as intensity modulation – direct detection (IM-DD) and optical heterodyne RoF systems. Wireless signal with specifications complying with IEEE 802.15.3c standard for the millimeter-wave frequency band is transmitted over the RoF links. The system performance is analyzed based on EVM evaluation. The analysis shows that effective analysis of microwave/millimeter-wave photonics systems is achieved by using circuit models which allows us to take into account both electrical and optical behaviors at the same time

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Akrout, Akram. "Contribution à l’étude des lasers à verrouillage de modes pour les applications en télécommunications". Thesis, Evry, Institut national des télécommunications, 2009. http://www.theses.fr/2009TELE0023/document.

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Ce travail de thèse porte sur l’étude des lasers à verrouillage de modes à bâtonnets quantiques (MLL QD) sur le système de matériau InAs/InP en vue de leur utilisation pour les applications télécoms. Contrairement aux lasers à deux sections, nous exploitons, tout au long de cette thèse, le phénomène du mélange à quatre-ondes qui est à l’origine du verrouillage de modes dans ces structures. Une analyse du « chirp » des impulsions générées par ce type de lasers, ainsi qu’une étude théorique et expérimentale pour le compenser, ont été décrites. En particulier, nous démontrons la compensation du « chirp » linéaire par un filtrage et par une fibre présentant une dispersion adéquate. D’autre part, une compensation du « chirp » d’ordre supérieur est possible en utilisant une fibre à dispersion spécifique. Une étude a été consacrée à la gigue temporelle, un autre paramètre crucial pour la plupart des applications utilisant les MLLs QD. Dans une première étape, nous avons mis en œuvre une technique de mesure par cross-corrélation optique pour caractériser la gigue temporelle des MLLs à haute fréquence de répétition. Contrairement à la technique de mesure par analyse spectrale, celle-ci permet d’effectuer des mesures à des fréquences de répétitions supérieures à 50 GHz et sur une plage de fréquence allant de presque 0 Hz à quelques centaines de MHz. Ensuite, nous avons caractérisé des diodes lasers présentant une largeur de raie RF record d’une valeur de 850 Hz. Une valeur de gigue de 500 fs a été mesurée sur la bande de fréquence [150 kHz-320 MHz]. Cette valeur correspond à une amélioration d’un facteur 25 par rapport à la valeur mesurée sur une structure à base de puits quantiques pour les mêmes bornes d’intégration. Nous avons également présenté une étude de la réduction du bruit de phase des MLLs basée sur l’effet de la réinjection optique. Nous avons ainsi obtenu une amélioration du niveau de bruit de phase d’un facteur supérieur à 15 dB par rapport à la technique optoélectronique standard. Ces résultats mettent en évidence le potentiel des MLL QD pour la génération des impulsions à très faibles gigue temporelle et ouvrent la voie pour la conception des oscillateurs tout-optiques à faible bruit de phase. Enfin, nous présentons la génération d’un peigne de fréquences WDM en utilisant un MLL QD. En utilisant une telle source, nous avons démontré une transmission canal par canal sur une distance de 50 km de fibre SMF à un débit de 10 Gbit/s. Ce résultat de toute première importance permet d’envisager l’utilisation des MLLs QD pour la transmission WDM
This PhD thesis deals with the integration of InP based quantum dash mode locked lasers for use in optical communication systems and microwave optoelectronic applications. The properties of pulse and characterization methods are described as well as requirements for application in communication systems. Experimental and analytic method for pulse “chirp” characterization and compensation are also discussed. In particular, we demonstrate that high order dispersion can be compensated using specific fibre length. The characterization of quantum dash based mode locked lasers, has shown their potential to generate high spectral purity self-pulsating signals, with state-of-the-art spectral linewidth of ~ 850 Hz. Especially, the importance of, and way to reduce high-frequency jitter is discussed. Indeed, a novel method for measurement of high-frequency jitter based on optical cross-correlation technique is implemented. Systematic investigation of 10 GHz passively mode locked laser based on InAs/InP quantum dashes emitting at 1.55 µm have demonstrated a reduced value of timing jitter of 500 fs in the 150 kHz – 320 MHz frequency range. Compared to typical passively mode-locked quantum well laser which exhibit timing jitter in the range 12 ps (150 kHz – 50 MHz), our device demonstrates an approximately 25 times improvement in timing jitter. Concerning microwave optoelectronic applications, we demonstrate that a low phase noise oscillator can be obtained using a QD MLL integrated in an optical self injection loop without any opto-electronic or electro-optic conversion. A significant reduction of the -3 dB linewedith as low as 200Hz was obtained thanks to optimised tuning of the optical external cavity length. The phase noise has been reduced from -75dBc/Hz to a level as low as -105dBc/Hz at an offset of 100kHz. This yields to ultra low timing jitter and shows the potential to fabricate simple, and yet low noise oscillators based on semiconductor lasers without any high frequency electronics, photodetector or modulator. Finally, we report, for the first time, error-free transmission of 8 WDM channels over 50 km long single mode fiber at 10 Gbit/s using comb-generation in a quantum dash based mode locked laser. Such good performance paves the way for the use of mode locked-lasers in WDM transmission and allows considering such a solution in an integrated WDM transceiver

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Livros sobre o assunto "Phase-Locked lasers"

Goldstein, B. AlGaAs heterojunction lasers. Hampton, Va: Langley Research Center, 1988.

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Hyuk, Kwon Jin, e United States. National Aeronautics and Space Administration. Scientific and Technical Information Service., eds. Phase stability of injection-locked beam of semiconductor lasers. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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A, Gregory Don, e United States. National Aeronautics and Space Administration., eds. Investigation of fiber optics based phased locked diode lasers: Phase correction in a semiconductor amplifier array using fiber optics : final report. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Dynamic characteristics of far-field radiation of current modulated phase-locked diode laser arrays. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Capítulos de livros sobre o assunto "Phase-Locked lasers"

Van de Capelle, J. P., R. Baets e P. E. Lagasse. "Self-Consistent Analysis of Waveguiding in Phase-Locked Array Lasers". In Springer Series in Optical Sciences, 112–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-540-39452-5_23.

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Yoshitomi, Dai, Yohei Kobayashi, Masayuki Kakehata, Hideyuki Takada e Kenji Torizuka. "100-Attosecond Synchronization of Two-color Mode-locked Lasers by use of Optical Phase Locking". In Springer Series in Optical Sciences, 389–96. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49119-6_51.

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Kappeler, F., H. Westermeier, R. Gessner, M. Druminski, C. Hanke e J. Luft. "High CW-Power Phase-locked Semiconductor Laser Arrays". In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering, 138–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82638-2_28.

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Winful, Herbert G. "Instabilities and Chaos in Phase Locked Semiconductor Laser Arrays". In Coherence and Quantum Optics VI, 1223–27. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0847-8_220.

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Winful, Herbert G. "Self-Organization and Spatio-Temporal Chaos in Phase-Locked Semiconductor Laser Arrays". In Laser Optics of Condensed Matter, 107. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3726-7_16.

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Koll, Lisa-Marie, Tobias Witting e Marc J. J. Vrakking. "Control of Photoelectron-Ion Entanglement in Attosecond Laser-Induced Photoionization of H2". In Springer Proceedings in Physics, 155–65. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-47938-0_15.

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AbstractWe report experiments where vibrational wave packets are produced in H2+ by the ionization of neutral H2 by a sequence of two phase-locked attosecond pulse trains (APTs) with a variable time delay. Changes in the degree of vibrational coherence in the H2+ cation with the XUV-XUV time delay can be explained in terms of the dependence of the degree of ion+photoelectron entanglement on the two-pulse delay.

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Jiang, Zhi, Chen-Bin Huang, Daniel E. Leaird e Andrew M. Weiner. "Spectral Line-by-Line Pulse Shaping of a Mode-Locked Laser and a Phase Modulated CW Laser". In Ultrafast Phenomena XV, 124–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_40.

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Jones, David J., Scott A. Diddams, Jinendra K. Ranka, Robert S. Windeler, Andrew J. Stentz, John L. Hall e Steven T. Cundiff. "Precise Control of the Pulse-to-Pulse Carrier-Envelope Phase in a Mode-Locked Laser". In Ultrafast Phenomena XII, 74–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56546-5_20.

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Liu, M., Z. W. Li, G. Y. Wen, X. N. Yu e Y. Z. Liu. "Study of a laser-echo simulation system with high precision and a wide range based on a phase-locked loop frequency multiplier". In Frontier Research and Innovation in Optoelectronics Technology and Industry, 147–54. London, UK : CRC Press/Balkema, an imprint of the Taylor & Francis Group, [2019]: CRC Press, 2018. http://dx.doi.org/10.1201/9780429447082-21.

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"- Bound Solitons by Active Phase Modulation Mode-Locked Fiber Ring Lasers". In Ultra-Fast Fiber Lasers, 312–45. CRC Press, 2018. http://dx.doi.org/10.1201/9781439811306-14.

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Trabalhos de conferências sobre o assunto "Phase-Locked lasers"

Zhang, Mengcheng, Xingcan Yan, Shaozhuang Yao, Yin Xu e Hualong Bao. "Phase Noise Measurment of Mode-Locked Lasers Without Dispersion Management". In 2024 22nd International Conference on Optical Communications and Networks (ICOCN), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/icocn63276.2024.10648568.

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Shirakawa, Akira. "Phase-locked Multicore Fiber Lasers". In CLEO: Science and Innovations. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/cleo_si.2014.sth4n.1.

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Nagaoka, Hideyuki, Taisuke Miura, Fumihiko Kannari, Kazuya Takasago, Kenji Torizuka e Masakazu Washio. "Precisely synchronized two mode-locked lasers with optical phase-locked loop". In Advanced Solid State Lasers. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/assl.2001.tub12.

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Scott, A. M., K. D. Ridley e P. Soan. "Stimulated Brillouin Scattering Phase-Locked Phase Conjugation". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cmk4.

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A new loop geometry was recently investigated for SBS phase conjugation and was shown to greatly improve the stability of the phase conjugation process by eliminating phase jumps which can degrade the stability and fidelity [1]. The loop increases the coherence length of the laser output [2], making it suitable for heterodyne laser radar.

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Bourdet, G. L., R. A. Muller, G. M. Mullot e J. Y. Vinet. "CO2 waveguide Injection-phase-locked lasers". In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 1986. http://dx.doi.org/10.1364/cleo.1986.wk17.

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Scott, A. M., K. D. Ridley e P. Sean. "Stimulated Brillouin Scattering Phase-Locked Phase Conjugation". In Proceedings of European Meeting on Lasers and Electro-Optics. IEEE, 1996. http://dx.doi.org/10.1109/cleoe.1996.562023.

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Streifer, W., Donald R. Scifres, P. S. Cross, D. F. Welch e R. D. Burnham. "Phase-locked semiconductor laser diode arrays". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.tug1.

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Phase-locked semiconductor diode laser arrays are capable of emitting light at high power in low divergence beams. Moreover, because of their small size and high electrical-to-optical conversion efficiency, these devices have many applications. The presentation begins with a review of semiconductor diode lasers and the principles of phased arrays. Various experiments relating to the lasers themselves and to their operation in external cavities are reviewed and the theory of their operation and conditions needed to favor lasing in a desired array mode (supermode) is discussed. The talk concludes with recent results concerning reliability.

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Ridley, K. D., e A. M. Scott. "Stimulated Brillouin scattering techniques for phase-locked phase conjugation". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cmc5.

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Phase-locked phase conjugation is the process of phase conjugating a number of laser beams whilst preserving their relative phases. Phase-locking is necessary when parallel laser amplifier channels are combined using phase conjugation, or when a depolarised beam is split into two orthogonal polarisations and phase conjugated.

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Fabiny, Larry, Pere Colet e Rajarshi Roy. "Phase dynamics of spatially coupled lasers". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thrr7.

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We have experimentally and theoretically investigated the coherence properties and phase dynamics of spatially coupled Nd:YAG lasers as a function of overlap of their fields. The dependence of phase locking on the overlap and detuning of the lasers, as well as noise sources, are studied. The coherence of the laser sources is directly determined from the visibility of interference fringes as recorded by a video camera system. Heterodyne measurements are used to determine the detuning between individual lasers. It is found that the lasers remain phase locked even when the overlap of their fields is extremely small, but then they display an abrupt transition to incoherence. When phase locked the laser fields are 180° out of phase with each other. A phase mask fabricated by binary optics procedures may be used to alter the phase relationship between the laser sources. Numerical solutions of a laser model that show very good agreement with experimental measurements will be presented, and the coherence-incoherence transition will be interpreted theoretically.

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Goldobin, I. S., Nickolay N. Evtikhiev, Andrei G. Plyavenek e Sergei D. Yakubovich. "Phase-locked integrated arrays of injection lasers". In High-Power Multibeam Lasers and Their Phase Locking, editado por Fedor V. Lebedev e Anatoly P. Napartovich. SPIE, 1993. http://dx.doi.org/10.1117/12.160393.

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Relatórios de organizações sobre o assunto "Phase-Locked lasers"

Warren, M. E., G. R. Hadley, K. L. Lear, P. L. Gourley, G. A. Vawter, J. C. Zolper, T. M. Brennan e B. E. Hammons. Phase-locked arrays of vertical-cavity surface-emitting lasers. Office of Scientific and Technical Information (OSTI), maio de 1994. http://dx.doi.org/10.2172/10163743.

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Ben-Itzhak, Itzik, Kevin D. Carnes, C. Lew Cocke, Charles W. Fehrenbach, Vinod Kumarappan, Artem Rudenko e Carlos Trallero. PULSAR: A High-Repetition-Rate, High-Power, CE Phase-Locked Laser for the J.R. Macdonald Laboratory at Kansas State University. Office of Scientific and Technical Information (OSTI), maio de 2014. http://dx.doi.org/10.2172/1130749.

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