WorldCat Identities

Bretenaker, Fabien

Overview
Works: 41 works in 74 publications in 2 languages and 2,338 library holdings
Genres: Conference papers and proceedings 
Roles: Author, Publishing director, Other, Opponent, Thesis advisor, Editor, htt
Publication Timeline
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Most widely held works by Fabien Bretenaker
Le laser 50 ans de découvertes by Fabien Bretenaker( )

16 editions published between 2010 and 2021 in French and English and held by 1,214 WorldCat member libraries worldwide

Après un bref rappel des principes, cet ouvrage offre un panorama des différents types de lasers, des plus petits aux plus puissants, et effectue un tour d'horizon de leurs applications : information et communication, sources de lumière ultrabrèves, mesures de grande précision, médecine, etc.--Memento
Laser : 50 years of discoveries by Fabien Bretenaker( )

15 editions published between 2014 and 2015 in English and held by 1,074 WorldCat member libraries worldwide

This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations. Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties. This book addresses every aspect of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology. -- Back cover
2017 International Conference on Optical Instruments and Technology : Optoelectronic Devices and Optical Signal Processing : 28-30 October 2017 Beijing, China by International Conference on Optical Instruments and Technology( Book )

2 editions published in 2018 in English and held by 5 WorldCat member libraries worldwide

Frequency stabilization of the non-resonant wave of a continuous-wave singly resonant optical parametric oscillator by Aliou Ly( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

ETUDE THEORIQUE ET EXPERIMENTALE DES MODES PROPRES ET ETATS PROPRES DANS LES LASERS EN ANNEAU : APPLICATIONS A LA GYROMETRIE ET A LA DETECTION D'EFFETS PETITS by Fabien Bretenaker( Book )

2 editions published in 1992 in French and held by 2 WorldCat member libraries worldwide

UNE DESCRIPTION SPATIALE ET VECTORIELLE DES MODES PROPRES ET ETATS PROPRES DANS LES LASERS EN ANNEAU EST EXPOSEE. LA DYNAMIQUE DES RAYONS SAGITTAL ET TANGENTIEL DE MODE SOUS L'INFLUENCE DES EFFETS DE LENTILLE RESONNANTS ET LES MECANISMES DE DIFFRACTION RESONNANTE ASSOCIES Y SONT ETUDIES POUR UN OU DEUX ISOTOPES. LA NON-RECIPROCITE DE CES MECANISMES EXPLIQUE ALORS LES BIAIS OBSERVES DANS LES GYROLASERS. LE ROLE DE LA DIFFRACTION DANS LA ZONE AVEUGLE EST AUSSI ISOLE, PERMETTANT D'OBSERVER LA ROTATION TERRESTRE PAR EFFET SAGNAC INVERSE. LA SEPARATION SPATIALE DES ETATS PROPRES PERMET DE CONSTRUIRE DES CAVITES A PLUSIEURS AXES DE PROPAGATION DONT LES ETATS PROPRES GENERALISENT SPATIALEMENT LE MODELE DES MATRICES DE JONES. CECI PERMET DE CONTROLER LE COUPLAGE ENTRE ETATS PROPRES, DE CREER DES ETATS PROPRES FOURCHUS, DE CONSTRUIRE UN LASER A DEUX FREQUENCES ACCORDABLES ET DE DECOUPLER COMPLETEMENT DEUX ETATS PROPRES CONTREPROPAGEANTS D'UN LASER EN ANNEAU. L'ETUDE DE LA STABILITE ET DE LA DYNAMIQUE DES ETATS PROPRES PERMET DE CONTROLER LA STABILITE DES ETATS PROPRES DE PLUSIEURS TYPES DE LASERS, DE MESURER DIRECTEMENT LE DECALAGE GOOS-HANCHEN EN FONCTION DE L'ANGLE D'INCIDENCE POUR UNE SEULE REFLEXION EN OPTIQUE ET DE CONSTRUIRE UN MAGNETOMETRE LASER A CHAMP MOYEN. LES INTERACTIONS NON LINEAIRES ENTRE LE MILIEU ACTIF ET LES TROIS GRANDS TYPES D'ONDES STATIONNAIRES SONT EXPLOREES AINSI QUE LES ECHANGES DE MOMENT CINETIQUE DANS DE TELLES CAVITES. ENFIN, LE COMPORTEMENT DES QUATRE ETATS PROPRES CIRCULAIRES D'UNE CAVITE EN ANNEAU EST ANALYSE, PERMETTANT DE CREER UNE SITUATION A DEUX ETATS CONTREPROPAGEANTS BIAISES DONT L'APPLICATION GYROMETRIQUE EST DISCUTEE
Analyse spectrale : études théoriques et expérimentales de l'analyseur à photographie spectrale by Guillaume Gorju( Book )

2 editions published in 2007 in French and held by 2 WorldCat member libraries worldwide

In this thesis, we are interested in the optical functions offered by the rare earth ions doped crystals for the RADARS and (sub)millimeter astronomy domains. The described functions use the very large bandwidths and high spectral selectivity of these materials cooled at low temperature. Thus, we propose an RF spectral analyzer with a broad bandwidth, a probability of interception equalled to unity, a high resolution and a high dynamic of measurement. The principle of the analyzer consists in exposing the material to one laser beam carrying the RF signal under investigation. The crystal acts as an analogical memory in which the spectra of the signals are continuously recorded. This memory has one lifetime about 10 ms. During this time, we measure the absorption spectrum using a frequency chirped laser. By this way, we have demonstrated a spectral analyzer presenting a 10 GHz bandwidth, a MHz resolution and a 100% probability of interception. The study of various experimental configurations enabled us to reach a dynamics range of measurement about 38 dB. The resolution and the precision of our experiments depend on the spectral purity of the reading laser frequency swept. Thus, we build an interferometer to measure all the frequency errors affecting the frequency chirped laser spectral purity. The system is shown to be able to measure laser frequency deviation form a perfectly linear chirp to better than 1 MHz. The system also provides an error signal that can be used to servo-loop controlled the laser frequency thanks to digital electronics
Génération paramétrique infrarouge dans les cristaux de La3Ga5,5Ta0,5O14 et BaGa4Se7 by Elodie Boursier( )

1 edition published in 2016 in French and held by 2 WorldCat member libraries worldwide

Nowadays, solid state laser is one way to access the infrared and terahertz light with a good coherence and a high brightness, for broad application prospects like spectroscopy and atmospheric molecules detection. The best way to generate this light is use second order parametric nonlinear optics which allows the frequency conversion of a monochromatic laser through a crystal with appropriate properties. However, the goal is find new materials since a lot of crystals already identified present a too low optical damage threshold for high energy applications. By combining two completely independent tunable and polarized beams in a sample cut as a sphere or a cylinder, we are able to take up the challenge. In this way, we could directly study the difference frequency generation in the whole transparency range by scanning one plane. The principle is to identify not only directions, called phase-matching, where the birefringence compensates the refractive index dispersion but also associated conversion efficiencies and spectral and angular acceptances. When the photons from the two incoming beams get through a crystal in these particular directions, other photons could be generated with higher wavelength and the higher amplitude of the nonlinear coefficient, the stronger the interaction. The PhD is devoted to the study of potential nonlinear crystals acquired thanks to international collaboration with leader group in the material elaboration. The results will enable to perform new parametric light sources like Optical Parametric Oscillator (OPO) or Optical Parametric Generator (OPG) tunable from infrared up to terahertz as the goal is to enhance the generated energy with respect to actual sources
Parametric infrared generation : from crystals to devices by Vincent Kemlin( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

This dissertation deals with the generation of parametric light in the range 1 to 12 µm. Parametric infrared generation turns out to be a challenge at the interface between the fields of nonlinear optics and materials science embodied by the two approaches used to achieve efficient frequency conversion. Birefringent Phase-Matching (BPM) in anisotropic materials has been the traditional solution used in most frequency converter devices. But since the 90's, the quick success of microstructured materials has paved the way for Quasi-Phase-Matching (QPM) even in isotropic materials, leading to a renewed interest in Optical Parametric Oscillators (OPO). The high degree of engineering offered by this technology is now widely recognized as a key competitive advantage. We obtained original results concerning parametric infrared generation using BPM as well as QPM.We have built the first OPO pumped by a 1.064 µm Nd:YAG laser and based on a 5-mm-thick crystal of 5%MgO:PPLN cut as a partial cylinder. This OPO combines a wide and continuous tunability over the range 1.4 µm - 4.4 µm with a good conversion efficiency, up to 30%. Despite the need to resort to pump intensities almost an order of magnitude higher than in a slab OPO, we have shown that the energetical performance of a partial cylinder OPO is now equivalent to that of a slab OPO besides a wider tunability that can be continuously addressed. When the same Nd:YAG laser pumps two such independent OPOs in parallel, we dispose of a highly versatile QPM dual wavelength source with two widely and independently tunable beams. We have built this unique source allowing versatile Difference Frequency Generation (DFG) towards the mid- and far- infrared. We carried out the first BPM DFG experiments with this source in a CdSe slab oriented for angular noncritical phase-matching at two different pump wavelengths, respectively 2.72 µm and 2.79 µm. The second set of DFG experiments were performed in a CdSe crystal cut and polished as a 5-mm-diameter full cylinder. Using a pump wavelength of 2.79 µm, we were able to tune the DFG wavelength from 8.3 µm up to 10.3 µm by rotating the crystal over an angular range of 18°. Contrary to all the BPM DFG experiments reported so far in the single crystal CdSe, tuning was achieved while keeping normal incidence of both the incident and generated beams in the crystal. The implementation of spectral narrowing techniques is already anticipated and will contribute to more accurate measurements of the phase-matching directions of a crystal as well as to a higher DFG conversion efficiency.These experiments with our dual wavelength source are preliminary and encouraging validations of our capability of performing DFG in small crystals and at any pump wavelength between 1.4 µm and 3.5 µm. Even though we investigated the promises held by CdSiP2 when it is only pumped with a Nd:YAG laser at 1.064 µm, there is tremendous prospect in terms of tunable infrared generation between 3.5 µm and 8 µm when this crystal is pumped around 2.4 µm. Such early demonstrations will be highly valuable for future applications requiring compact and tunable sources spanning the infrared spectrum. From a more fundamental point of view, performing DFG experiments at different pump wavelengths in the mid-infrared can lead to a highly accurate determination of the values of the refractive indices of a nonlinear crystal. In this dissertation, we have cast the first stone of a method that leads to the determination of the values of the refractive indices of a nonlinear crystal in the mid- to far- infrared. This new method is based on the unique measurements of the DFG phase-matching angles in spheres or cylinders, and should contribute to further advances in the field of phase-matching metrology
Développement de lasers solides agiles ultra-stables pour la manipulation cohérente de systèmes atomiques : applications au traitement optique de signaux radiofréquences et à l'information quantique by Vincent Crozatier( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

In this thesis, we take advantage of the spectral properties of rare-earth ion-doped crystals to perform time-to-frequency Fourier transform operations. We introduce the first experimental demonstration of coherent processing of radiofrequency (RF) signals over a wide bandwidth. Our system is based on an excitation sequence using frequency-swept pulses, deriving from photon echoes. Thanks to this algorithm, the RF signal spectrum is displayed in the time domain. Experimentally, we measured impressive performances in an Er:Y2SiO5 crystal, using an optical transition in the telecommunication window. Indeed, the instantaneous bandwidth reaches 1.5 GHz, together with 24,000 independent frequency channels. The resolution can be as low as 50 kHz, and the dynamic range of the process is 32 dB. These results are obtained thanks to the development of a specific laser source, whose frequency can be tuned over several GHz in few µs. A servo loop ensures an excellent precision of the frequency scans. Other laser sources have also been built up: one uses waveguide structures; another one is frequency-locked on an optical reference cavity, in order to reach a sub-kHz emission linewidth. We also introduce a first study of photon echoes generated in an amplifying Er:Y2SiO5 crystal. This way, the energy efficiency of the process is increased. New dephasing mechanisms occurring during the photon echo stimulation are highlighted
Etudes de nouveaux cristaux non linéaires pour une génération paramétrique dans l'infrarouge avec la plus grande largeur spectrale possible by Feng Guo( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Nowadays, the optical parametric generators (OPG) with the broadest spectral bandwidth is a good alternative cover band II (2-5 µm) or band III (8-12 µm) of transmission range of the atmosphere. We were interested in such an emission from quadratic nonlinear processes under birefringence phase-matching conditions (BPM). It is performed in the transparency range of already identified nonlinear crystals, but they are not satisfying. Then this PhD work is devoted first to the study of GdCa4O(BO3)3 (GdCOB) biaxial crystal, and La3Ga5.5Nb0.5O14 (LGN) and NaI3O8 uniaxial crystals. We recorded their tuning curves and conversion efficiencies for BPM. We selected second harmonic generation and difference frequency generation in slabs, spheres or cylinders. We refined the Sellmeier equations. We determined the magnitude of the nonlinear coefficients, spectral and angular acceptances in uniaxial crystals. We also determined the magnitude and sign of all the nonlinear coefficients of BaGa4Se7 biaxial crystal. All these results provide reliable data for further experimental evaluations of OPG broadest spectral bandwidth covering band II or III using these crystals.Key words: nonlinear optics, parametric generation, phase-matching, nonlinear crystals
Mélange à quatre ondes atomique dans un réseau optique by Marie Bonneau( )

1 edition published in 2011 in French and held by 1 WorldCat member library worldwide

In this thesis, an experiment of correlated atom pairs production through four-wave mixing in an optical lattice is described. The twin atoms are analogous to the twin photons produced by parametric down conversion, used in many fondamental quantum optics experiments, and applied in interferometry and quantum information. Because of the dispersion relation, phase matching can be obtained when atoms move in a periodic potential. Four-wave mixing then spontaneously occurs and is a special case of dynamical instability. We performed the experiment with a degenerate metastable helium gas, obtained in a very elongated optical trap. A moving optical lattice, whose characterisation can also be found in the manuscript, was applied on the atoms. The resulting four-wave mixing was studied using a 3D-resolved single atom detector. The phase-matching conditions of this process and the populated modes were investigated. We showed that with our method atoms are preferentially scattered into two narrow classes with tunable velocities and populations. This versatility should be an advantage when using the pairs in future experiments. For each of these velocity classes, we mesured a Hanbury Brown and Twiss local correlation. Furthermore, we demonstrated relative number squeezing between both classes. These two simultaneous effects indicate the non-classicality of the generated pairs, which can be used in quantum atom optics experiments, for example to observe the Hong-Ou-Mandel effect with atoms
Nonlinear properties of phase-sensitive fiber-optic parametric amplifiers for signal processing by Weilin Xie( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

The capability and performance of the widely deployed fiber-optic and photonic systems strongly depend on the noise and nonlinearities of the optical amplifiers. In this context, phase-sensitive fiber-optic parametric amplifiers (PS-FOPAs), relying on four-wave mixing in optical fibers, outperforms conventional phase-insensitive amplifier thanks to the unique phase-sensitivity that can be exploited for noiseless amplification and mitigation of the nonlinear impairment. In conjunction with the vast gain spectrum and other functionality such as wavelength conversion, they have been regarded as a promising candidate for the next generation optical amplifiers towards all-optical communication and processing.The PS-FOPA is conventionally described by the fundamental coupled wave equations derived from the nonlinear Schrödinger equation that contains only three or four interacting waves. However, for a more general case, the emergence of high-order waves will inevitably affect the phase-sensitivity. The objective of this thesis aims at the thorough investigation of the nonlinear properties in terms of the gain properties and the phase sensitivities with respect to different configurations of a dual-pump signal-idler degenerate PS-FOPA. The more accurate numerical analysis is obtained by using the 7-wave model that incorporates the first order high-order waves stemming from the high-order four-wave mixing processing. This model permits to assess a more precise physical interpretation of the multi-wave interactions based on phase matching conditions, revealing the underlying relations between the dispersion and the phase-sensitivity. Moreover, the simultaneous phase and amplitude regenerative capability of a basic PS-FOPA is evaluated for the overall optimization. It allows fully exploiting the potential ability of a basic PS-FOPA acting as a fundamental building block of the future all-optical functionalities. The analysis approach based on this model permits application-oriented optimization and is of particular guiding significance for design and optimization of PS-FOPA in various scenarios
Le laser Ed. 2 by Fabien Bretenaker( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

Plus de cinquante ans après leur invention, les lasers continuent à nous étonner. Leurs performances sont toujours plus extraordinaires et le champ de leurs applications ne cesse de s’étendre. Ils sont omniprésents dans notre vie quotidienne pour les lecteurs de CD, de DVD et de codes-barres et comme ingrédients essentiels des autoroutes de l’information. Ils sont devenus irremplaçables dans l’industrie et les hôpitaux. Ils permettent aussi des avancées spectaculaires de la recherche fondamentale : optique quantique, horloges ultra précises, lasers à atomes, tests de la relativité générale. Ce livre préfacé par Charles Townes, prix Nobel et inventeur du laser, a été écrit par les meilleurs spécialistes français du domaine. Après un bref rappel des principes, cet ouvrage offre un panorama des différents types de lasers, des plus petits aux plus puissants. Il effectue un vaste tour d’horizon de leurs applications et donne un aperçu des développements les plus récents. Cette seconde édition a été enrichie et mise à jour afin de couvrir certains aspects les plus récents de l’optique quantique, de la métrologie, et de la physique des atomes froids et des molécules froides. La première édition de ce livre a obtenu le prix Prix Arnulf-Françon 2011 de la Société Française d'Optique. Ce prix récompense la réalisation de supports pédagogiques destinés à l'enseignement de l'Optique dans l'enseignement supérieur
Combinaison cohérente de lasers à cascade quantique by Guillaume Bloom( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

Powerful sources in the mid-infrared with a good beam quality are highly needed for applications such as optical countermeasures. The quantum cascade laser (QCL) is a promising solution but the maximum power achievable is not sufficient. The coherent beam combining of several QCL could lead to higher output power in the same beam and thus is an interesting solution to circumvent the current power limitation of these sources.We present a theoretical and experimental study of the coherent beam combining of QCL in a common external cavity with a beam combiner. The phase locking is totally passive since it is only based on loss minimization in the external cavity: it is a self-organization process. A general model is developed to quantify the combining efficiency and the stability that can be obtained from this method. Experimentally, the coherent combining of two QCL in a Michelson cavity is studied first and demonstrated to be efficient and stable. In order to combine more emitters, an efficient beam combiner must be designed in the mid-infrared. For that purpose, two type of gratings, a classical binary phase grating (or Dammann grating) and a more complex gradient-index structure made of local sub-wavelength patterns are designed and compared. The calculation and optimization of this sub-wavelength structure is based on the artificial media theory and is achieved with rigorous coupled wave analysis (RCWA). Finally, the coherent combining of five QCL in an external cavity with a binary phase grating is demonstrated and the scalability to the combining of more emitters is discussed. In conclusion, we present an original solution to combine coherently several QCL and thus address the power scaling issue in the mid-infrared
Développement d'un oscillateur paramétrique optique continu intense et à faible bruit pour des applications aux communications quantiques. by Aliou Ly( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

La portée des communications quantiques est limitée à quelques dizaines de km en raison de l'atténuation dans les fibres. Les répéteurs quantiques (relais quantiques synchronisés par des mémoires quantiques photoniques) furent introduits afin d'accroître ces distances. Or, pour le moment, les mémoires les plus performantes fonctionnent à des longueurs d'onde n'appartenant pas à la bande C télécom. Afin de profiter de ces mémoires, l'utilisation d'interfaces quantiques (milieu non linéaire quadratique) fut proposée comme alternative. En ajoutant ainsi par somme de fréquences un photon de pompe de longueur d'onde appropriée au photon télécom portant l'information, on transfère l'information à une longueur d'onde compatible avec les mémoires, et ceci sans dégradation de l'information portée initialement par le photon télécom. Notre but est ainsi de construire un oscillateur paramétrique optique continu simplement résonant (SRO) qui fournira un faisceau à 1648 nm qui sera sommé en fréquence aux photons télécom à 1536 nm pour transférer l'information vers un photon stockable dans une mémoire à base d'atomes alcalins. Pour transférer efficacement l'information, le SRO doit satisfaire quelques critères : une haute finesse spectrale (largeur de raie ~kHz), une forte puissance (~1W) et une longueur d'onde plus grande que celle du photon télécom à convertir. Pour ce faire, nous utilisons le faisceau non-résonant d'un SRO continu. Le premier travail réalisé dans cette thèse a été de faire la démonstration de la possibilité d'avoir un faisceau à la fois intense et pur spectralement en sortie d'un SRO continu. En réutilisant un SRO déjà développé durant nos travaux antérieurs, nous avons pu stabiliser au niveau du kHz la fréquence du faisceau non résonant à 947 nm (onde signal) de ce SRO, tout en émettant une puissance de plus d'un watt. Ensuite, nous avons conçu le SRO dont le faisceau non résonant à 1648 nm (onde complémentaire) a été stabilisé à court terme en-dessous du kHz avec une puissance de l'ordre du watt. Nous avons ensuite étudié la stabilité à long terme de la longueur d'onde du complémentaire à 1648 nm. Nous avons mesuré des dérives de fréquences de l'ordre de 10 MHz/mn. Ces dérives, venant essentiellement de la cavité de référence sur laquelle le SRO est asservi, peuvent être réduites en contrôlant activement la cavité d'une part, et en utilisant des techniques de stabilisation en fréquence robustes, d'autre part
Gyromètre optique basé sur une cavité résonante passive en fibre à cœur creux by Alexia Ravaille( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

In this manuscript, we report the theoretical and experimental developments at TRT, TAV and LAC, aiming the realization of a hollow-core passive resonant fiber optical gyroscope that can achieve navigation grade performances. We mathematically describe the Sagnac effect, which is a relativistic effect used to optically probe mechanical rotations. Then, we detail the state of the art in passive resonant fiber optical gyroscope development. We identify their limitations, and explain why the hollow core fiber seems to be the best solution to cope with the actual limitations of such gyroscopes. We then focus on two different types of hollow core fibers: Kagome and photonic bandgap. We evaluate their performances in terms of transmission, polarization holding and backscattering. We describe the first measurement of a lock in region in a hollow core fiber passive optical gyroscope, i.e the range of rotation rates that cannot be measured because of backscattering. A mathematical model is propounded to link the lock in to the backscattering of the cavity. We then discuss the experimental protocol that we implemented to circumvent this limitation. Finally, we characterize the performances of our gyroscope based on these features
Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d'atomes individuels by Charles Tuchendler( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

This thesis presents the early work done on a new setup that we have developped for trapping single atoms in an optical tweezer using only one diffraction limited large numerical aperture aspheric lens. Together with an experimental optical measurement of a 1µm laser beam waist created by such an aspheric lens, we showed that the diffraction limited transverse field of the lens is about plus or minus 25 µm. The ability of this new setup to trap single atoms is demonstrated and some crucial parameters are then determined : survival time in the dark, heating rate, fluorescence light polarisation, oscillation frequencies. During this PhD, we did focus our attention especially on determining the energy distribution of the single trapped atoms. A release and recapture technique along with the spectroscopic study of the energy levels occupation helped us show a termal behavior of a succession of single atoms in an optical twezer. By using common laser cooling techniques associated with adiabatic down ramping cooling, we showed that a reduction by a factor 100 of the mean energy corresponding to a mean vibrationnal energy level of about 4 and a minimum temperature of 1,75 µK. Spatial manipulation of single atoms and qubits was also studied. Using a tip-tilt platform, a second trap is set on the experiment and the transfer from one trap to the other, as well as the displacement of one trap with help of the platform, are experimentally studied. Both the temperature of the atoms and the qubit lifetime are showed to be insensitive to these manipulations
Slow light in two dimensional semi-conductor photonic crystals by Patricio Grinberg( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

We report on the combination of slow light propagation with the resonance properties of a photonic crystal (PhC) cavity and with the slow mode of a PhC waveguide. We demonstrate theoretically and experimentally that slow light induced by the Coherent Population Oscillation (CPO) effect enables to have small-size and ultrahigh quality (Q) factor cavity, regardless of the technological and design issues. The experimental proof is performed in a L3 2D PhC cavity with semiconductor quantum wells as active, medium in which the CPO effect is induced. We achieve a cavity Q-factor of 520000, which corresponds to an enhancement by a factor 138 in comparison with the original Q-factor of the cavity. We present a theoretical approach to the combination of CPO-based slow light and slow mode in PhC waveguides, showing that the total group index is a multiplication of the group indices associated respectively to the CPO slow light and to the waveguide slow mode. We also set the basis for the experimental demonstration by designing and fabricating samples in the clean room facilities of LPN and addressing the challenging issue of coupling and extracting light in and from the waveguides. A particular design of the PhC in the waveguide is issued as a grating that allows to couple light perpendicularly to the plane of the PhC from free space. The vertical coupler has also been designed and fabricated along the waveguide and has been experimentally characterized. Slow light based on CPO effect in the PhC waveguides is always under experimental investigation
Stockage d'impulsions lumineuses dans l'hélium métastable à température ambiante by Marie-Aude Maynard( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

The need to synchronise quantum information and communication protocols implies the use of quantum memories. Different physical systems are investigated nowadays, among which ions in crystals, cold atoms and atomic vapours. The most common protocol is based on the Electromagnetically Induced Transparency (EIT) phenomenon: a light pulse is engraved in the Raman coherence of both ground states of an atomic Lambda-type three-level system. Though it opens promising perspectives, with respect to efficiency, fidelity and storage time, this technique is, however, sensitive to dephasing effects such as magnetic field gradients.In this thesis, I first study the storage of classical light pulses via EIT in a room- temperature metastable helium vapor. The obtained experimental results agree with the numerical simulation of the complete Maxwell-Bloch equations of the system. In particular, the existence of an extra phase acquired by the retrieved pulse is demonstrated in the detuned configuration, which can be explained by the propagation of the signal beam in the medium. In the second part, I experimentally isolate, in the same system, a new storage protocol based on the Coherent Population Oscillation (CPO) phenomenon, which is by nature more robust than EIT to dephasing effects. The numerical simulations allow us to precisely analyse the mechanisms involved in a CPO memory and, in particular, the influence of the relative phase between the signal and coupling beams on the storage efficiencies
Contribution à la réduction du bruit d'intensité relatif des lasers à semiconducteurs pour des applications aux radars by Ghaya Baili( Book )

in French and held by 1 WorldCat member library worldwide

The objective of the following thesis is to study two original techniques aiming at reducing the Relative Intensity Noise (RIN) of semiconductor lasers used in optical links for transmission of radar signals. Within the first technique, a dispersion compensating fiber exhibiting low losses is used to study the phase to amplitude noise and amplitude to phase noise conversion mechanisms with a very good signal-to-noise ratio over à 20 GHz bandwidth. The second technique consists in increasing the photon lifetime well above the carrier lifetime in order to eliminate adiabatically the carrier population effects, leading to a relaxation oscillation free class-A laser operation. Two laser architectures have been proposed, theoretically analyzed and experimentally validated. The first configuration is based on a semiconductor optical amplifier in a long fibred cavity. The second one uses a ½-VCSEL in a high-Q external cavity. For both configurations, we demonstrated that class-A laser operation leads to a shot-noise-limited RIN (at -155 dB/Hz for 1 mA detected) over a frequency bandwidth from 100 MHz to 18 GHz
 
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