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Author: PHILIPPE.. CASSARD
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
ETUDE THEORIQUE. PROPRIETES ENERGETIQUES DE L'OSCILLATEUR LASER TEA CO::(2). ETUDE EXPERIMENTALE DE L'INJECTION CONTINUE. VERROUILLAGE PAR INJECTION DES MODES D'ORDRE SUPERIEUR D'UN RESONATEUR INSTABLE DANS UN LASER TEA CO::(2) DE TRES GRANDE PUISSANCE
Author: PHILIPPE.. CASSARD
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
ETUDE THEORIQUE. PROPRIETES ENERGETIQUES DE L'OSCILLATEUR LASER TEA CO::(2). ETUDE EXPERIMENTALE DE L'INJECTION CONTINUE. VERROUILLAGE PAR INJECTION DES MODES D'ORDRE SUPERIEUR D'UN RESONATEUR INSTABLE DANS UN LASER TEA CO::(2) DE TRES GRANDE PUISSANCE
Author: Eric Akmansoy
Publisher:
ISBN:
Category :
Languages : fr
Pages : 194
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Book Description
Cette thèse est divisée en trois parties. La première partie rassemble les éléments théoriques de l'étude concernant respectivement -i) la cinétique du milieu amplificateur CO2 -ii) la description des modes des résonateurs -iii) le verrouillage par injection continue des lasers impulsionnels.La deuxième partie rapporte la réalisation d'un laser CO2 TEA d'énergie 1-10 Joule, sa caractérisation électrique et optique, les résultats de verrouillage suivant différentes configurations et la confrontation expérience théorie. La détection hétérodyne des impulsions permet de mesurer les principales caractéristiques du verrouillage monomode par injection: la largeur de la bande de verrouillage et l'intensité minimum requise.D'autres schémas d'injection sont considérés : -i) l'injection continue dans un laser en anneau -ii) l'injection bimode transverse dans un lasser à résonateur instable.La troisième partie de la thèse est une étude détaillée des variations de fréquence et des effets d'indice de réfraction qui en sont responsables.Au cours de cette thèse, des performances nouvelles ont été obtenues de grand intérêt pour les applications LIDAR. En particulier, c'est la première fois que grâce à l'emploi d'un résonateur instable, des impulsions monomodes de 1 Joule et durant 5μs sont obtenues à 10 μm avec des puissances injectées aussi faibles que 200nW. Il est également démontré que la dérive de fréquence peut être considérablement réduite. C'est enfin la première fois que le fonctionnement bimode longitudinal d'un laser de grande énergie est contrôlé par l'injection d'un faible signal dans la cavité
Author: PHILIPPE.. DOARE
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
CETTE ETUDE SE SITUE DANS LE CADRE DES TRANSMISSIONS OPTIQUES COHERENTES ET A POUR BUT D'AMPLIFIER LE SIGNAL OPTIQUE A L'EMISSION D'UN SYSTEME AFIN D'EN ACCROITRE LA PORTEE. LA TECHNIQUE PROPOSEE EST LE VERROUILLAGE PAR INJECTION OPTIQUE DE DEUX LASERS SEMICONDUCTEURS. LE PREMIER LASER, DIT LASER MAITRE, PRESENTE UN COMPORTEMENT MONOFREQUENCE ET UNE TRES BONNE PURETE SPECTRALE, ADAPTEE AU DEBIT DE LA LIAISON. ON MONTRE ALORS QUE SOUS CERTAINES CONDITIONS D'INJECTION OPTIQUE, LE LASER ESCLAVE SE VERROUILLE EN FREQUENCE SUR LE LASER MAITRE ET ACQUIERT LES PROPRIETES SPECTRALES DE CE DERNIER. UNE AMPLIFICATION DU SIGNAL OPTIQUE EST POSSIBLE EN CHOISISSANT UN LASER ESCLAVE DE PLUS FORTE PUISSANCE QUE LE LASER MAITRE. ON MONTRE EGALEMENT Q'UNE MODULATION DU COURANT D'ALIMENTATION GENERE, EN REGIME DE SYNCHRONISATION, UNE MODULATION DE PHASE DU SIGNAL OPTIQUE RESULTANT. LES DEUX FONCTIONS AMPLIFICATEUR RESONNANT ET MODULATEUR DE PHASE SONT ETUDIEES DANS CE TRAVAIL. UNE APPLICATION DE CETTE TECHNIQUE D'AMPLIFICATION A UN SYSTEME DE TRANSMISSION EST DECRITE. IL S'AGIT D'UNE TRANSMISSION OPTIQUE COHERENTE UTILISANT UNE DETECTION HOMODYNE A DIVERSITE DE PHASE. LES LASERS (EMETTEUR ET OSCILLATEUR LOCAL) UTILISES DANS CE SYSTEME SONT DES LASERS STABILISES EN FREQUENCE DE MANIERE ABSOLUE ET INDEPENDANTE SUR UNE LONGUEUR D'ONDE DE REFERENCE. LE LASER ESCLAVE EST UN LASER DE TYPE BH (BURIED HETEROSTRUCTURE) ET LE GAIN NET OBTENU EST DE L'ORDRE DE 10 DB
Author: Alexander V. Sergienko
Publisher: CRC Press
ISBN: 1420026607
Category : Science
Languages : en
Pages : 248
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Book Description
All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
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: Jiří Sýkora
Publisher:
ISBN:
Category : Automatic control
Languages : ru
Pages : 1048
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Book Description
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: Fabien Bretenaker
Publisher: World Scientific
ISBN: 9814612421
Category : Science
Languages : en
Pages : 185
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Book Description
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 aspects 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.
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.
