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Author: Henri Porte
Publisher:
ISBN:
Category :
Languages : fr
Pages : 190
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Book Description
Cet exposé est scindé en deux parties distinctes. La première partie porte sur la réalisation d’un dispositif électro-optique de balayage de la longueur d’onde d’émission d’un laser à colorant. Deux retombées de ce dispositif concernent 1) la transmission des signaux électriques par modulation de longueur d’onde, 2) le fonctionnement bistable en longueur d’onde du laser à colorant par application d’une contre réaction non linéaire de la longueur d’onde émise sur le modulateur. La seconde partie est relative à la mise en œuvre d’une liaison multiplexe par fibre multimodes à deux canaux de transmission. La méthode consiste à moduler de façon externe à l’aube de modulateurs électro-optiques disposés en série, la lumière émise par une diode laser à spectre de raies
Author: Henri Porte
Publisher:
ISBN:
Category :
Languages : fr
Pages : 190
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Book Description
Cet exposé est scindé en deux parties distinctes. La première partie porte sur la réalisation d’un dispositif électro-optique de balayage de la longueur d’onde d’émission d’un laser à colorant. Deux retombées de ce dispositif concernent 1) la transmission des signaux électriques par modulation de longueur d’onde, 2) le fonctionnement bistable en longueur d’onde du laser à colorant par application d’une contre réaction non linéaire de la longueur d’onde émise sur le modulateur. La seconde partie est relative à la mise en œuvre d’une liaison multiplexe par fibre multimodes à deux canaux de transmission. La méthode consiste à moduler de façon externe à l’aube de modulateurs électro-optiques disposés en série, la lumière émise par une diode laser à spectre de raies
Author: EMMANUEL.. DUPONT
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
LES MULTI-PUITS QUANTIQUES GAAS/GAALAS PERMETTENT DE REALISER LES FONCTIONS DE MODULATION DE PHASE ET D'AMPLITUDE D'ONDES MOYEN-INFRAROUGE VIA LES TRANSITIONS INTERSOUSBANDES. CES TRANSITIONS OPTIQUES FORTEMENT RESONNANTES DANS LA GAMME SPECTRALE 8-12 M SONT A L'ORIGINE DES SUSCEPTIBILITES NON LINAIRES ELEVEES DE CES HETEROSTRUCTURES. LES MODULATIONS DE PHASE ET D'AMPLITUDE PAR DES EFFETS ELECTROOPTIQUES DU PREMIER ET DU SECOND ORDRE SONT TOUT PARTICULIEREMENT ETUDIEES ICI. L'ELECTROREFRACTION LIEE A LA MODIFICATION DE LA DISPERSION D'INDICE ASSOCIEE AUX TRANSITIONS INTERSOUSBANDES EST MISE EN EVIDENCE PAR INTERFEROMETRIE LASER. LA TRANSFORMATION DE KRAMERS-KRONIG PERMET DE DEMONTRER LA CORRELATION DIRECTE ENTRE L'ELECTROREFRACTION ET L'ELECTROABSORPTION. TROIS TYPES DE STRUCTURES SONT PROPOSES. LES MODULATEURS A EFFET STARK SONT ETUDIES DANS UN PREMIER TEMPS. ILS SONT CONSTITUES DE PUITS ASYMETRIQUES, LA MODULATION CONSISTE A MODIFIER, PAR UN CHAMP ELECTRIQUE EXTERNE, LA LONGUEUR D'ONDE DE RESONANCE INTERSOUSBANDE. LA SECONDE POSSIBILITE CONSISTE A MODIFIER ELECTRIQUEMENT LA FORCE D'OSCILLATEUR DES TRANSITIONS INTERSOUSBANDES. POUR CE FAIRE, ON UTILISE DES DOUBLES PUITS QUANTIQUES OU DEUX NIVEAUX EXCITES SONT, A TENSION NULLE, A L'ANTICROISEMENT. L'INFLUENCE DE LA DENSITE ELECTRONIQUE SUR L'ABSORPTION INTERSOUSBANDE ET LA DISPERSION D'INDICE ASSOCIEE EST EGALEMENT ETUDIEE. DES DOUBLES PUITS QUANTIQUES ASYMETRIQUES SONT PROPOSES. LA TECHNIQUE CONSISTE A APPLIQUER UN CHAMP ELECTRIQUE POUR TRANSFERER PAR EFFET TUNNEL DES ELECTRONS D'UN PUITS VERS L'AUTRE. CE FAISANT, PUISQUE LES PUITS N'ONT PAS LES MEMES ENERGIES DE RESONANCE INTERSOUSBANDE, ON AGIT SUR L'OCCURRENCE DE DEUX TRANSITIONS OPTIQUES. LES PERFORMANCES DE CES TROIS DISPOSITIFS SONT COMPARABLES: TYPIQUEMENT 20% POUR LE TAUX DE MODULATION D'AMPLITUDE ET /38 RADIANS POUR LE DEPHASAGE, TOUS DEUX INDUITS PAR UN CHAMP ELECTRIQUE DE 20 KV/CM
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: T. Okoshi
Publisher: Springer Science & Business Media
ISBN: 9789027726773
Category : Technology & Engineering
Languages : en
Pages : 302
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Book Description
Author: Stefano Boccaletti
Publisher: A I P Press
ISBN:
Category : Mathematics
Languages : en
Pages : 384
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Book Description
The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.
Author: Rolf Binder
Publisher: World Scientific
ISBN: 9813148764
Category : Science
Languages : en
Pages : 517
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Book Description
This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.
Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
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Book Description
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Author: Xavier Begaud
Publisher: John Wiley & Sons
ISBN: 1118586573
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Author: Alain Sibille
Publisher: Academic Press
ISBN: 0123821959
Category : Technology & Engineering
Languages : es
Pages : 385
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Book Description
Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Author: Stefan Enoch
Publisher: Springer
ISBN: 364228079X
Category : Science
Languages : en
Pages : 331
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Book Description
This book deals with all aspects of plasmonics, basics, applications and advanced developments. Plasmonics is an emerging field of research dedicated to the resonant interaction of light with metals. The light/matter interaction is strongly enhanced at a nanometer scale which sparks a keen interest of a wide scientific community and offers promising applications in pharmacology, solar energy, nanocircuitry or also light sources. The major breakthroughs of this field of research originate from the recent advances in nanotechnology, imaging and numerical modelling. The book is divided into three main parts: extended surface plasmons polaritons propagating on metallic surfaces, surface plasmons localized on metallic particles, imaging and nanofabrication techniques. The reader will find in the book: Principles and recent advances of plasmonics, a complete description of the physics of surface plasmons, a historical survey with emphasize on the emblematic topic of Wood's anomaly, an overview of modern applications of molecular plasmonics and an extensive description of imaging and fabrications techniques.
