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 Guided wave Erbium written by Chi-hung Huang and published by . This book was released on 1997 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Beam Shaping and Control with Nonlinear Optics written by F. Kajzar and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of nonlinear optics, which has undergone a very rapid development since the discovery of lasers in the early sixties, continues to be an active and rapidly developing - search area. The interest is mainly due to the potential applications of nonlinear optics: - rectly in telecommunications for high rate data transmission, image processing and recognition or indirectly from the possibility of obtaining large wavelength range tuneable lasers for applications in industry, medicine, biology, data storage and retrieval, etc. New phenomena and materials continue to appear regularly, renewing the field. This has proven to be especially true over the last five years. New materials such as organics have been developed with very large second- and third-order nonlinear optical responses. Imp- tant developments in the areas of photorefractivity, all optical phenomena, frequency conv- sion and electro-optics have been observed. In parallel, a number of new phenomena have been reported, some of them challenging the previously held concepts. For example, solitons based on second-order nonlinearities have been observed in photorefractive materials and frequency doubling crystals, destroying the perception that third order nonlinearities are - quired for their generation and propagation. New ways of creating and manipulating nonl- ear optical materials have been developed. An example is the creation of highly nonlinear (second-order active) polymers by static electric field, photo-assisted or all-optical poling. Nonlinear optics involves, by definition, the product of electromagnetic fields. As a con- quence, it leads to the beam control.
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 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 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 Nanophotonics written by Hervé Rigneault and published by Wiley-ISTE. This book was released on 2006-07-18 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanophotonicsis a comprehensive introduction to the emerging area concerned with controlling and shaping optical fields at a subwavelength scale. Photonic crystals and microcavities are extensively described, including non-linear optical effects. Local-probe techniques are presented and are used to characterize plasmonic devices. The emerging fields of semiconductor nanocrystals and nanobiophotonics are also presented.
Download or read book Experimental Chaos written by Stefano Boccaletti and published by A I P Press. This book was released on 2004-12-14 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1993-04 with total page 1774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Merriam Webster s Rhyming Dictionary written by and published by . This book was released on 2007 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This new edition of Merriam-Webster's Rhyming Dictionary contains over 71,000 rhyming words, about 16,000 more than the first edition. The additions naturally include words that have come into common use since the earlier book's publication -- words such as busk, blog, out-there, dreadlocked, fearmonger, and jaw-dropper. But most of the book's additions are not actually new to the language. For the first time, most of the two-, three-, four-, and five-word entries found in Merriam-Webster's Collegiate Dictionary have been given their own place in this volume's lists of rhyming words."--Preface.
Download or read book Semiconductor Disk Lasers written by Oleg G. Okhotnikov and published by John Wiley & Sons. This book was released on 2010-03-30 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely publication presents a review of the most recent developments in the field of Semiconductor Disk Lasers. Covering a wide range of key topics, such as operating principles, thermal management, nonlinear frequency conversion, semiconductor materials, short pulse generation, electrical pumping, and laser applications, the book provides readers with a comprehensive account of the fundamentals and latest advances in this rich and diverse field. In so doing, it brings together contributions from world experts at major collaborative research centers in Europe and the USA. Each chapter includes a tutorial style introduction to the selected topic suitable for postgraduate students and scientists with a basic background in optics - making it of interest to a wide range of scientists, researchers, engineers and physicists working and interested in this rapidly developing field. It will also serve as additional reading for students in the field.
Download or read book Advanced Signal Processing and Digital Noise Reduction written by Saeed V. Vaseghi and published by Vieweg+Teubner Verlag. This book was released on 1996-05 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bayesian Estimation and classification. Hidden markov models. Wiener filters. Kalman and adaptive least squared error filters.
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 Ultra Wide Band Antennas written by Xavier Begaud and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
