Download or read book LASERS GUIDES D ONDES DANS LE NIOBATE DE LITHIUM DOPE NEODYME written by ERIC.. LALLIER and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE NIOBATE DE LITHIUM DOPE AU NEODYME CONSTITUE UN MATERIAU LASER SOLIDE POSSEDANT A LA FOIS LES PROPRIETES LASER DES IONS NEODYMES ET LES PROPRIETES NON LINEAIRES ET ELECTRO-OPTIQUES DU NIOBATE DE LITHIUM. L'UTILISATION COMBINEE DE CES PROPRIETES EST D'AUTANT PLUS EFFICACE DANS UNE CONFIGURATION OPTIQUE GUIDEE MONOMODE OU LE CONFINEMENT IMPORTANT DE L'ENERGIE LUMINEUSE AUGMENTE LE GAIN DU LASER, L'EFFICACITE DES INTERACTIONS NON LINEAIRES ET PERMET LA REALISATION DE COMPOSANTS ELECTRO-OPTIQUES A FAIBLES TENSIONS DE COMMANDE. CE MEMOIRE PRESENTE L'ETUDE ET LA REALISATION DE LASERS GUIDES POMPES A 0.814 MICRON, EMETTANT A 1.084 MICRON ET FONCTIONNANT DE FACON CONTINUE, EN REGIME DECLENCHE. NOUS AVONS TOUT D'ABORD ETUDIE LES PROPRIETES SPECTROSCOPIQUES DU MATERIAU ND:MGO:LINBO3 ET LES MODIFICATIONS INDUITES PAR L'ECHANGE PROTONIQUE SERVANT A LA FABRICATION DES GUIDES D'ONDES. NOUS AVONS PU ALORS FABRIQUER DES GUIDES A FAIBLES PERTES ET REALISER DES LASERS MONOLITHIQUES EMETTANT JUSQU'A PLUSIEURS DIZAINES DE MW ET PRESENTANT DES SEUILS D'OSCILLATIONS DE 1.5 MW DE POMPE COUPLEE AVEC DES RENDEMENTS VOISINS DE 50%. PAR LA SUITE, L'INTEGRATION D'UN MODULATEUR DE PHASE A PERMIS DE TRANSFORMER L'EMISSION CONTINUE DU LASER EN UN TRAIN D'IMPULSIONS A MODES BLOQUES DE 250 MW DE PUISSANCE CRETE, DE 7 PS DE LARGEUR ET A UNE FREQUENCE DE REPETITION DE 6 GHZ POUR UN POMPAGE DE 50 MW. ENFIN, NOUS AVONS REUSSI A DEMONTRER LE FONCTIONNEMENT DU LASER EN REGIME DECLENCHE EN INTEGRANT UN COUPLEUR DIRECTIONNEL PERMETTANT LA MODULATION DES PERTES INTRACAVITE. DES PUISSANCES CRETES ATTEIGNANT 350 W ET DES LARGEURS DE 300 PS ONT ETE OBTENUES JUSQU'A DES TAUX DE REPETITION DE QUELQUES KHZ POUR UNE PUISSANCE DE POMPE COUPLEE DE 14 MW

Download or read book LASERS GUIDES D ONDE DANS LE NIOBATE DE LITHIUM DOPE ERBIUM written by ARNAUD.. GRISARD and published by . This book was released on 1997 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE NIOBATE DE LITHIUM DOPE A L'ERBIUM PERMET DE TIRER PARTI DES PROPRIETES OPTIQUES DES IONS TERRE RARE ET DU FORT COEFFICIENT ELECTRO-OPTIQUE DE LA MATRICE. IL CONSTITUE AINSI UN MATERIAU PROMETTEUR POUR LA REALISATION DE LASERS DECLENCHES MONOLITHIQUES EMETTANT VERS 1,5 M. EN CONFIGURATION GUIDEE, L'OBTENTION D'IMPULSIONS A FORTE PUISSANCE CRETE EST EN PARTICULIER ENVISAGEABLE A PARTIR D'UN POMPAGE PAR DIODE LASER DU COMMERCE ET AVEC DE FAIBLES TENSIONS DE COMMANDE. DANS CETTE PERSPECTIVE, UN MECANISME PREPONDERANT DE REDUCTION DU GAIN AUX FORTES CONCENTRATIONS DE DOPANT, CARACTERISTIQUE DES CRISTAUX DOPES DANS LA MASSE, A ETE IDENTIFIE ET UNE METHODE ORIGINALE DEVELOPPEE POUR EVALUER SIMPLEMENT SES EFFETS DE FACON QUANTITATIVE. CE MEMOIRE SOULIGNE L'EXCELLENT ACCORD ENTRE LES PREVISIONS THEORIQUES DU MODELE D'AMPLIFICATION OPTIQUE MIS EN PLACE PUIS ADAPTE AU CAS DE GUIDES MONOMODES ET LES MESURES REALISES SUR LES COMPOSANTS FABRIQUES DANS LE MEME TEMPS PAR DIFFUSION DE BANDES DE TITANE DANS DES SUBSTRATS DOPES DANS LA MASSE ET EN SURFACE. CECI A PERMIS D'OBSERVER POUR LA PREMIERE FOIS L'EFFET LASER EN CONTINU DANS DES GUIDES D'ONDE SUR NIOBATE DE LITHIUM DOPE A L'ERBIUM DANS LA MASSE ET POMPES PAR UNE DIODE A 1,48 M. L'INTEGRATION DE MODULATEURS ELECTRO-OPTIQUES A EGALEMENT CONDUIT A L'OBSERVATION D'IMPULSIONS DECLENCHEES. POUR L'INSTANT LIMITEES PAR LA PUISSANCE DE POMPE DISPONIBLE, ELLES DEVRAIENT POUVOIR ATTEINDRE PLUSIEURS CENTAINES DE WATTS DE PUISSANCE CRETE AVEC DES DUREES DE QUELQUES NANOSECONDES.

Download or read book LASERS ET EFFETS NON LINEAIRES GUIDES DANS LE NIOBATE DE LITHIUM written by QING.. HE and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE NIOBATE DE LITHIUM DOPE TERRES RARES N'EST PAS SEULEMENT UN CRISTAL NON LINEAIRE, ELECTROOPTIQUE, C'EST AUSSI UN BON MATERIAU ACTIF POUR L'EFFET LASER ET L'AMPLIFICATION COMME NOUS LE MONTRONS DANS CE TRAVAIL. CE MEMOIRE PORTE D'ABORD SUR LA REALISATION PAR ECHANGE PROTONIQUE DE GUIDES D'EXCELLENTE QUALITE OPTIQUE SUR ND:MGO:LINBO#3. ENSUITE, NOUS AVONS ETUDIE THEORIQUEMENT ET EXPERIMENTALEMENT L'EFFET LASER A 1,085 M EN CONFIGURATION GUIDEE DANS ND:MGO:LINBO#3. LES RESULTATS EXPERIMENTAUX S'ACCORDENT BIEN AUX PREVISIONS THEORIQUES. POUR EXPLOITER EGALEMENT L'EFFET NON LINEAIRE DANS LINBO#3, NOUS AVONS REALISE UN LASER AUTO-DOUBLE EN FREQUENCE. L'HARMONIQUE DU LASER A ETE OBSERVE EN DEUX CONFIGURATIONS: GUIDEE ET CERENKOV. LE RENDEMENT DE CONVERSION OBTENU EN CONFIGURATION GUIDEE EST DE 4%/CM#2/MW, CE QUI NE PEUT ETRE AMELIORE. EN CONFIGURATION CERENKOV, LE RENDEMENT DE CONVERSION EST FAIBLE DU A LA PROFONDEUR DU GUIDE QUI N'EST PAS OPTIMISEE. POUR ATTEINDRE LES RENDEMENTS PLUS IMPORTANTS (100%/CM/MW), IL FAUT OPTIMISER LA PROFONDEUR DU GUIDE EN CONFIGURATION CERENKOV TOUT EN CONSERVANT DE FAIBLES PERTES POUR LES DEUX FREQUENCES EN INTERACTION, CE QUI EST POSSIBLE TECHNIQUEMENT. LE DERNIER CHAPITRE DU MEMOIRE DECRIT UNE NOUVELLE TECHNIQUE POUR LE DOUBLAGE DE FREQUENCE: MODULATION PERIODIQUE SIMULTANEE DES INDICES ET DU #2 DANS LINBO#3 PAR ECHANGE PROTONIQUE. UNE FOIS CETTE TECHNIQUE MAITRISEE, NOUS POURRONS ENVISAGER DE L'UTILISER POUR REALISER DES LASERS AUTO-DOUBLES EN FREQUENCE

Download or read book OSCILLATION LASER ET SPECTROSCOPIE DANS LES GUIDES D ONDE TANTALATE DE LITHIUM DOPE NEODYME REALISES PAR ECHANGE PROTONIQUE written by SALIM.. NOUH and published by . This book was released on 1994 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA THESE PORTE SUR L'ETUDE THEORIQUE ET EXPERIMENTALE DE L'OSCILLATION LASER DANS LES GUIDES D'ONDES REALISES PAR ECHANGE PROTONIQUE DANS ND:LITAO#3. LES PREMIERS ESSAIS LASER ONT MONTRE UNE PUISSANCE SEUIL TRES IMPORTANTE DE 58 MW ET UNE OSCILLATION INSTABLE. CES PERFORMANCES ONT ETE SENSIBLEMENT AMELIOREES, EN REDUISANT PAR RECUIT, LA CONCENTRATION DE PROTONS. NOUS AVONS OBTENU UN SEUIL DE 24 MW, ET UNE EMISSION CONTINUE DE 8 MW A 1082 NM. CE QUI CONSTITUE UN RECORD MONDIAL DANS UN GUIDE D'ONDE ND:LITAO#3, LE SEUIL RESTANT NEANMOINS NETTEMENT SUPERIEUR AUX PREVISIONS THEORIQUES. POUR COMPRENDRE LES AMELIORATIONS APPORTEES ET L'ECART DES PERFORMANCES PAR RAPPORT AUX VALEURS THEORIQUES, UNE ETUDE CRISTALLOGRAPHIQUE ET SPECTROSCOPIQUE DETAILLEE DU SUBSTRAT ND:LITAO#3 ET DES GUIDES D'ONDES REALISES DANS CE DERNIER PAR ECHANGE PROTONIQUE A ETE MENEE. ELLE A MONTRE QU'EN FONCTION DE LA CONCENTRATION DE H#+, LES GUIDES PEUVENT PRESENTER DIFFERENTES PHASES CRISTALLINES ET QUE LES PROPRIETES SPECTROSCOPIQUES DU NEODYME VARIENT SENSIBLEMENT D'UNE PHASE A L'AUTRE. DANS LES PHASES A FORTE CONCENTRATION DE PROTONS, NOUS AVONS MIS EN EVIDENCE DEUX FAMILLES D'IONS ND#3#+ DONT L'UNE A UNE TRES COURTE DUREE DE VIE 2,9 S ET DE PROPORTION DE 60%. LA PRESENCE DE CES IONS EST A L'ORIGINE DU SEUIL ELEVE. LE RECUIT, REDUISANT LA CONCENTRATION DE PROTONS, DIMINUE LA PROPORTION DE CES IONS ET AMELIORE AINSI LES CARACTERISTIQUES DU LASER. ENFIN NOUS AVONS MIS EN EVIDENCE UNE PHASE PERMETTANT D'ASSURER UN BON CONFINEMENT DES ONDES LUMINEUSE ET DANS LAQUELLE LA DUREE DE VIE EST DE 82 S. CECI NOUS A PERMIS REALISER UNE SOURCE LASER INTEGREE PERFORMANTE SUR ND:LITAO#3 AYANT LA PLUS PETITE PUISSANCE SEUIL (3 MW) ET LA PLUS GRANDE EFFICACITE DIFFERENTIELLE (30%) JUSQU'A CE JOUR. MALHEUREUSEMENT, DES INSTABILITES DUES A L'EFFET PHOTOREFRACTIF SONT TOUJOURS PRESENTS

Download or read book Ultra cold Fermi Gases written by M. Inguscio and published by . This book was released on 2007 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Fiber Communications written by Senior John M. and published by Pearson Education India. This book was released on 2009 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Fiber Optic Gyroscope Second Edition written by Herve C. Lefevre and published by Artech House. This book was released on 2014-10-01 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by one of the field’s leading experts, this landmark reference presents a thorough system analysis of the fiber-optic gyroscope (FOG), describing the concepts that have emerged as the preferred solutions for obtaining a practical device. This book’s first edition was published in the early 1990’s. If the basic design rules of the FOG have remained unchanged, the technology has certainly matured, and the expectations presented in the first edition have been largely exceeded. This second edition is updated throughout, featuring new content on Allan variance; testing with optical coherence domain polarimetry; the Shupe effect; and rare-Earth doped fiber ASE sources. In addition, brand new comprehensive appendixes cover the optics, single-mode fiber optics, and integrated optics necessary to understand the fiber gyro and provide an appropriate vocabulary for communicating with electronic component designers.

Download or read book Damage in Laser Materials written by Alexander J. Glass and published by . This book was released on 1970 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Literature An Annotated Guide written by Kiyo Tomiyasu and published by Springer. This book was released on 1968 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geometrical And Physical Optics written by R.S. Longhurst and published by Orient Blackswan. This book was released on 1986 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published In India In 1986, This Book Is Intended Primarily For Undergraduate Students Of Physics. It Will Also Be Useful For Postgraduate Students Specialising In Optics. This Revised Edition Incorporates New Material, Including The Techniques Of Matrix Algebra And Fourier Methods In Solving Problems In Optics. The Chapter On Photometry Has Been Revised. Important Problems Have Been Outlined Along With Comments, At The End Of The Book.

Download or read book Thin Films for Optical Systems written by Flory and published by CRC Press. This book was released on 1995-07-06 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents advances in thin films for applications in the fields of integrated optics, micro-optics, optical telecommunications and optoelectronics. It delineates the performance characteristics needed for graded coatings, damage-resistant laser coatings and many others. Basic theory and applications are illustrated.

Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

Download or read book Characterization Techniques and Tabulations for Organic Nonlinear Optical Materials written by Carl W. Dirk and published by Routledge. This book was released on 2018-05-11 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt: ""Furnishes table of nonlinear optical properties of organic substances as well as experimental procedures for measuring the nonlinearity of the elements tabulated, including composite materials-offering support for scientists and engineers involved in characterizing, optimizing, and producing materials for manufacturing optical devices.

Download or read book Quantum Gas Experiments Exploring Many body States written by Paivi Torma and published by World Scientific. This book was released on 2014-09-16 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum phenomena of many-particle systems are fascinating in their complexity and are consequently not fully understood and largely untapped in terms of practical applications. Ultracold gases provide a unique platform to build up model systems of quantum many-body physics with highly controlled microscopic constituents. In this way, many-body quantum phenomena can be investigated with an unprecedented level of precision, and control and models that cannot be solved with present day computers may be studied using ultracold gases as a quantum simulator.This book addresses the need for a comprehensive description of the most important advanced experimental methods and techniques that have been developed along with the theoretical framework in a clear and applicable format. The focus is on methods that are especially crucial in probing and understanding the many-body nature of the quantum phenomena in ultracold gases and most topics are covered both from a theoretical and experimental viewpoint, with interrelated chapters written by experts from both sides of research.Graduate students and post-doctoral researches working on ultracold gases will benefit from this book, as well as researchers from other fields who wish to gain an overview of the recent fascinating developments in this very dynamically evolving field. Sufficient level of both detailed high level research and a pedagogical approach is maintained throughout the book so as to be of value to those entering the field as well as advanced researchers. Furthermore, both experimentalists and theorists will benefit from the book; close collaboration between the two are continuously driving the field to a very high level and will be strengthened to continue the important progress yet to be made in the field.

Download or read book Optics Photonics and Laser Technology written by Paulo A. Ribeiro and published by Springer. This book was released on 2018-10-13 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers key theoretical and practical aspects of optics, photonics and lasers. It addresses optical instrumentation and metrology, photonic and optoelectronic materials and devices, nanophotonics, organic and bio-photonics and high-field phenomena. Researchers, engineers, students and practitioners interested in any of these fields will find a wealth of new methods, technologies, advanced prototypes, systems, tools and techniques, as well as general surveys outlining future directions.

Download or read book Liquid Crystals of One and Two Dimensional Order written by W. Helfrich and published by Springer. This book was released on 2012-01-19 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference on liquid crystals of one- and two-dimensional order and their applications is the third in a series of European conferences devoted mainly to smectic liquid crystals. Its purpose was to bring together people working on the frontiers of the field of liquid crystals. Ordinary nematic liquid crystals were left out in order to limit the size of the meeting. The number of registered participants still reached 148. The conference shed new light on the classification of smectic mesophases, especially through the interaction of the Halle (GDR) and Hull (England) groups. It saw lively discussions on the famous blue phase of cholesterics. There were illuminating presentations on lyotropic nematic liquid crystals, on reentrant nematics, mesomorphic polymer phases, and related subjects. Much room was given to bilayers, monolayers, and interfaces, mostly to further the use of the concepts and methods of liquid crystal physics in exploring bio membranes. Other topics were device applications of smectic and cholesteric liquid crystals and nematic polymers, both of which hold promise of techno logical breakthroughs, apart from their scientific interest.

Download or read book Prussian Blue type Nanoparticles and Nanocomposites written by Yannick Guari and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanochemistry tools aid the design of Prussian blue and its analogue nanoparticles and nanocomposites. The use of such nanomaterials is now widely regarded as an alternative to other inorganic nanomaterials in a variety of scientific applications. This book, after addressing Prussian blue and its analogues in a historical context and their numerous applications over time, compiles and details the latest cutting-edge scientific research on these nanomaterials. It compiles and deatils the latest cutting-edge scientific research on these nanomaterials. The book provides an overview of the methodological concepts of the nanoscale synthesis of Prussian blue and its analogues, as well as the study and understanding of their properties and of the extent and diversity of application fields in relation to the major societal challenges of the 21st century on energy, environment, and health.