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Etude Des Effets De Polarisation Dans Des Guides Doptique Integree Sur Verre
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Book Synopsis Étude des effets de polarisation dans des guides d'optique intégrée sur verre by : Thiemo Lang
Download or read book Étude des effets de polarisation dans des guides d'optique intégrée sur verre written by Thiemo Lang and published by . This book was released on 1997 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS PROPOSONS UNE ETUDE EXPERIMENTALE APPROFONDIE DES EFFETS DE POLARISATION DANS DES GUIDES FAITS PAR ECHANGE D'IONS K#+/NA#+ DANS LE VERRE. UNE MEILLEURE COMPREHENSION DE CES EFFETS EST INDISPENSABLE A LA REALISATION DES CIRCUITS D'OPTIQUE INTEGREE PERFORMANTS. ELLE NOUS PERMETTRA EGALEMENT DE PROPOSER DE NOUVEAUX COMPOSANTS AGISSANT SUR LA POLARISATION. LA BIREFRINGENCE DES GUIDES CONFINES A ETE ETUDIEE D'UNE FACON SYSTEMATIQUE EN FONCTION DES DIFFERENTS PARAMETRES DE FABRICATION. NOUS AVONS DETERMINE LES CONDITIONS NECESSAIRES A LA REALISATION DE GUIDES A FAIBLE OU A FORTE BIREFRINGENCE. DES GUIDES CONFINES MONOMODES A FORTE BIREFRINGENCE ALLANT JUSQU'A 4.10#-#4 ONT ETE OBTENUS. A CAUSE DE L'INTERACTION DES CHAMPS DE CONTRAINTES CREES PENDANT L'ECHANGE IONIQUE, LES COUPLEURS SYMETRIQUES ET ASYMETRIQUES ONT LEURS AXES PRINCIPAUX LOCAUX INCLINES PAR RAPPORT A LA NORMALE AU PLAN DE LA LAME DE VERRE, CE QUI LIMITE LEUR POTENTIEL DE REALISER DES COMPOSANTS A MAINTIEN DE POLARISATION. LA VALIDITE D'UN MODELE THEORIQUE DECRIVANT L'INCLINAISON DES QUATRE MODES PROPRES D'UN COUPLEUR SUIVANT LES AXES GEOMETRIQUES OU LES AXES PRINCIPAUX LOCAUX A ETE DEMONTREE EXPERIMENTALEMENT SUR DES COUPLEURS DE DIFFERENTES GEOMETRIES. UNE METHODE SIMPLE ET ORIGINALE DE REDRESSEMENT DES AXES PRINCIPAUX DES COUPLEURS A PERMIS LA MISE AU POINT DES COMPOSANTS A MAINTIEN DE POLARISATION REALISES PAR L'ECHANGE D'IONS DE K#+/NA#+. L'INCLINAISON DES AXES PRINCIPAUX ET L'AUGMENTATION DE LA BIREFRINGENCE D'UN GUIDE SOUMIS A L'INFLUENCE D'UN GUIDE VOISIN A PERMIS LA CONCEPTION DE CONVERTISSEURS DE POLARISATION PASSIFS BASES SUR DES SECTIONS DE CONTRAINTES ASYMETRIQUES. UN CONVERTISSEUR DE POLARISATION A QUATRE SECTIONS ALTERNEES PRESENTANT UN TAUX DE CONVERSION DE POLARISATION DE 97%, DES PERTES DE PROPAGATION ESTIMEES A 0.3 DB/CM ET UNE LONGUEUR TOTALE DE 16 MM A ETE REALISE. CES PERFORMANCES SONT PARMI LES MEILLEURES PUBLIEES JUSQU'A PRESENT. A CELA S'AJOUTE LA SIMPLICITE ET LA REPRODUCTIBILITE DU PROCESSUS DE FABRICATION.
Book Synopsis Méthode modale généralisée pour l'étude de dispositifs d'optique intégrée by : Philippe Gérard
Download or read book Méthode modale généralisée pour l'étude de dispositifs d'optique intégrée written by Philippe Gérard and published by . This book was released on 1994 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS PROPOSONS UNE TECHNIQUE NUMERIQUE ORIGINALE APPELEE RSM POUR LA PROPAGATION D'UN CHAMP OPTIQUE DANS UNE STRUCTURE DIELECTRIQUE PLANAIRE SANS PERTES ET DE FORME ARBITRAIRE. C'EST UNE TECHNIQUE ENTIEREMENT MODALE DONT LA BASE DE DECOMPOSITION DES CHAMPS EST CONSTITUEE DES MODES PROPRES LOCAUX GUIDES ET RAYONNES DE LA STRUCTURE. ELLE CUMULE LES AVANTAGES DES DIVERSES BPM MAIS S'EN DISTINGUE PAR LE FAIT QU'ELLE PEUT TRAITER DES GEOMETRIES DES GUIDES QUI PRESENTENT DES FORTS CHANGEMENTS DE DIRECTION, DES FORTES DISCONTINUITES D'INDICE ET DES EFFETS DE POLARISATION. NOUS DEMONTRONS LES POTENTIALITES DE CETTE METHODE A L'AIDE DE PLUSIEURS EXEMPLES CHOISIS VOLONTAIREMENT COMME TRES DEMONSTRATIFS DES INTERETS DE LA METHODE ET QUI NE PEUVENT ETRE CORRECTEMENT TRAITES A L'AIDE DES OUTILS EXISTANTS. CE SONT: LE MIROIR A REFLEXION TOTALE ET PARTIELLE, L'HYBRIDATION DE PHOTODETECTEURS SILICIUM SUR UN GUIDE REALISE SUR VERRE CETTE METHODE A ETE UTILISEE POUR FAIRE UNE ETUDE SYSTEMATIQUE DES CROISEMENTS DE GUIDES A TOUS LES ANGLES ET QUELLES QUE SOIENT LES CONDITIONS DE GUIDAGE. DE PLUS, NOUS AVONS MENE UNE ETUDE DES GUIDES COURBES REALISES PAR ECHANGE D'IONS SUR VERRE. CES DEUX GEOMETRIES DE GUIDES ONT ENSUITE ETE UTILISEES POUR LA REALISATION D'UN COMPOSANT D'APPLICATION. IL S'AGIT D'UN INTERFEROMETRE DE MACH ZEHNDER ASYMETRIQUE DONT LA DIFFERENCE DE LONGUEURS ENTRE LES DEUX BRAS EST DE 6,6 MILLIMETRES. NOUS AVONS DEMONTRE QUE LA REPONSE FREQUENTIELLE D'UN TEL DISPOSITIF LORSQU'IL EST ECLAIRE PAR UNE LUMIERE MODULEE PAR UN SIGNAL MICROONDES EST CELLE D'UN FILTRE REJECTEUR DE FREQUENCE. LES PERFORMANCES DE NOTRE COMPOSANT SONT LES SUIVANTES: FREQUENCE DE REJECTION 15 GHZ, TAUX DE REJECTION: 15 DB OPTIQUES ET LARGEUR DE BANDE DE 700 MHZ
Book Synopsis Dimensionnement et réalisation d'un rotateur de polarisation à évolution de mode en optique intégrée sur verre by : Elodie Jordan
Download or read book Dimensionnement et réalisation d'un rotateur de polarisation à évolution de mode en optique intégrée sur verre written by Elodie Jordan and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La création du premier laser en 1960 puis l'envol des télécommunications par fibres optique a généré le développement des circuits optiques intégrés. Ces derniers sont des solutions efficaces aux problèmes d'encombrement et d'instabilité. Un contrôle accru des signaux passe cependant par l'exploitation de la polarisation qui permet notamment d'augmenter les débits, de fiabiliser les signaux et de protéger les sources par une isolation optique. Cette dernière application fait partie d'un vaste projet mené par l'IMEP-LAHC en collaboration avec le laboratoire Hubert Curien de Saint-Etienne. L'isolateur sur verre comprend l'intégration d'un séparateur de polarisation, d'un rotateur Faraday et d'un rotateur réciproque de polarisation à 45°. L'objectif de ces travaux «était de démontrer la faisabilité de la dernière fonction. La réalisation s'est basée sur l'exploitation d'échanges d'ions assistés par un champ électrique (EAC). Une première étape a consisté à maîtriser les effets de bords inhérents aux EAC, afin de modeler le cœur d'un guide d'onde et incliner les axes neutres de polarisation. Ceci a été obtenu en cascadant deux EAC, le premier créant un guide d'indice de réfraction uniforme, le deuxième modelant son cœur. Le contrôle de la position des axes neutres a ainsi été démontrée pour la première fois dans cette technologie puisqu'une inclinaison à (46,6 ± 0,1)° en entrée et (42,3 ± 0,1)° en sortie a été mesurée. L'étude numérique du procédé de fabrication du rotateur réciproque a également été effectuée et l'adiabaticité du composant a été validé analytiquement. Une première réalisation a mis en évidence un problème de pertes élevées liées au dégazage des sels d'échange. Des pistes d'optimisation sont donc avancées. Une suggestion d'amélioration du rotateur Faraday est également présentée. Elle exploite les progrès obtenus sur les EAC et démontre la faisabilité de guides d'ondes à biréfringence négative. Finalement un procédé de fabrication de l'isolateur complet, compatible avec le budget thermique, est proposé.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Experimental Chaos by : Stefano Boccaletti
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.
Book Synopsis Modern Surface Organometallic Chemistry by : Jean-Marie Basset
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Book Synopsis Light Filaments by : Jean-Claude Diels
Download or read book Light Filaments written by Jean-Claude Diels and published by IET. This book was released on 2022 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume starts with tutorials about the science of filamentation before presenting in-depth chapters on the latest research, technologies and applications. It cover wide aspects of light filaments considering various mediums of propagation, with structured or single filaments, and filaments of different colours, as well as combined filaments. It also includes a wide range of applications from strong field ionisation and molecular properties to laser development and beam shaping, THz, lasing in air and supercontinuum generation.
Book Synopsis Organic Solid-State Lasers by : Sébastien Forget
Download or read book Organic Solid-State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Watsuji Tetsuro's Rinrigaku by : Tetsur? Watsuji
Download or read book Watsuji Tetsuro's Rinrigaku written by Tetsur? Watsuji and published by SUNY Press. This book was released on 1996-01-01 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Watsuji Tetsuro's Rinrigaku (literally, the principles that allow us to live in friendly community) has been regarded as the definitive study of Japanese ethics for half a century. In Japan, ethics is the study of human being or ningen. As an ethical being, one negates individuality by abandoning one's independence from others. This selflessness is the true meaning of goodness.
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Book Synopsis Laser: 50 Years Of Discoveries by : Fabien Bretenaker
Download or read book Laser: 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Poetry by Women in Ireland by : Lucy Collins
Download or read book Poetry by Women in Ireland written by Lucy Collins and published by Liverpool University Press. This book was released on 2012-01-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uncovering the hidden history of poetry written by women in Ireland from 1870 to 1970, this anthology includes more than 180 poems by fifteen women with diverse backgrounds, experiences, and creative aims. Challenging the assumption that women wrote little poetry of note during this period, this rich and original collection reveals the range of their achievement and the lasting value of their work. Presented alongside biographical sketches of their authors, the poems span the political and the personal. From nationalist ballads to modernist lyrics, this book is an essential resource for students and scholars of Irish literature.
Book Synopsis The Art of the Pose by : Heather Marcovitch
Download or read book The Art of the Pose written by Heather Marcovitch and published by Peter Lang. This book was released on 2010 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book revisits Oscar Wilde's major writings through the field of performance studies. Wilde wrote about performance as a cultural dialectic, as a form of serious and critical play, and as the basis of a subversive poetics. In his studies at Oxford University, his famous lecture tour of the United States and Canada, his friendships with famous actresses Sarah Bernhardt and Lillie Langtry, the writing of his critical essays, The Picture of Dorian Gray, Salome, and his society comedies, and culminating in his post-prison writings De Profundis and The Ballad of Reading Gaol, Wilde develops a rich theory of performance that addresses aesthetics, ethics, identity and individualism. This book also traces Wilde's often-troubled relationship with late-Victorian society in terms of its attempts to define his public performances by stereotyping him as both irrelevant and dangerous, from the early newspaper caricatures to its later description of him as a sexual monster.
Book Synopsis The Select Speeches by : Daniel O'Connell
Download or read book The Select Speeches written by Daniel O'Connell and published by . This book was released on 1871 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Farewell Spain written by Kate O'Brien and published by Little Brown and Company (UK). This book was released on 2006 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This distinctly personal elegy was written during the early days of the Spanish Civil War by a writer whose future was indelibly marked by a year of travelling in a unique and changing country. A series of reminiscences, impressions and vivid insights, Kate O'Brien's thoughtful journey offers something unique at every stage, and captures perfectly the spirit of a lost place and the experience of travel and memory.
Book Synopsis Roman Catholics and Unity by : Enda McDonagh
Download or read book Roman Catholics and Unity written by Enda McDonagh and published by Hassell Street Press. This book was released on 2021-09-09 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
