Download or read book tude et r alisation de guides d onde en optique int gr e written by François Cochet and published by . This book was released on 1982 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ETUDE NUMERIQUE ET EXPERIMENTALE DES GUIDES D ONDES OPTIQUES SEGMENTES written by PIERRE.. ASCHIERI and published by . This book was released on 1999 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES GUIDES D'ONDES OPTIQUES SEGMENTES OFFRENT DES PROPRIETES OPTIQUES INTERESSANTES POUR DIFFERENTS DOMAINES DE L'OPTIQUE INTEGREE. ILS SONT UTILISES EN OPTIQUE NON-LINEAIRE OU ILS PERMETTENT DE REALISER LA CONDITION DE QUASI-ACCORD DE PHASE, LE PROCESSUS DE FABRICATION DES GUIDES REALISANT CONJOINTEMENT LE GUIDAGE ET L'INVERSION PERIODIQUE DES DOMAINES FERROELECTRIQUES. CE TYPE DE GUIDE PRESENTE AUSSI UN INTERET EN OPTIQUE LINEAIRE OU IL PROPOSE ALORS UNE SOLUTION ALTERNATIVE SIMPLE A UN PROBLEME TECHNOLOGIQUE COMPLEXE QUI EST DE REALISER DES GUIDES DONT L'INDICE OPTIQUE VARIE LONGITUDINALEMENT. CECI PERMET DE CHANGER LE CONFINEMENT DES MODES QUI SE PROPAGENT DANS LE GUIDE ET DE CHANGER AINSI LA TAILLE DES MODES EN AGISSANT COMME DE VERITABLES ENTONNOIRS A LUMIERE. CEPENDANT LES GUIDES SEGMENTES COMPORTENT DES PERTES INTRINSEQUES QUI DEPENDENT FORTEMENT DE LA TOPOLOGIE DU GUIDE. LA MODELISATION DE LA PROPAGATION DE LA LUMIERE DANS CE TYPE DE STRUCTURE ET L'EXPLICATION DE L'APPARITION DES PERTES PERMET DE DEFINIR DES CONFIGURATIONS OPTIMALES POUR LE GUIDAGE DE LA LUMIERE. AINSI, LES PERTES DE PROPAGATION PEUVENT ETRE TRES FAIBLES, INFERIEURES A 0.1 DB/CM, POUR UN GUIDE PERIODIQUEMENT SEGMENTE ET LA TRANSFORMATION DE LA TAILLE DES MODES AU COURS DE LA PROPAGATION PEUT SE FAIRE DE FACON QUASIMENT ADIABATIQUE SI LA GEOMETRIE DES GUIDES EST JUDICIEUSEMENT CHOISIE. CETTE PROPRIETE EST UTILISEE POUR OPTIMISER LES PERFORMANCES DE DISPOSITIFS UTILISANT DES GUIDES SEGMENTES POUR REALISER DE LA MODULATION ELECTROPTIQUE OU DU FILTRAGE DE MODE. LE FAIT QUE LES PERTES DE PROPAGATION PUISSENT ETRE MODULEES PAR LES CONDITIONS DE GUIDAGE MONTRE UNE APPLICATION POTENTIELLE POUR LA LIMITATION OPTIQUE.
Download or read book Etude et r alisation de guides d ondes optiques plans dans la silice amorphe par implantation ionique written by and published by . This book was released on 1974 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ETUDE DE GUIDES D ONDE DOPES TERRES RARES EN OPTIQUE INTEGREE SUR VERRE EN VUE DE REALISER UN AMPLIFICATEUR OPTIQUE written by Jean-Emmanuel Broquin and published by . This book was released on 1997 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE DEVELOPPEMENT DES TELECOMMUNICATIONS OPTIQUES A ENTRAINE UN BESOIN GRANDISSANT EN COMPOSANTS ACTIFS. LA REALISATION DE COMPOSANTS INTEGRES UTILISANT DES VERRES DOPES AVEC DES TERRES RARES EST UNE SOLUTION INTERESSANTE POUR REPONDRE A CE BESOIN. L'UTILISATION DE VERRES FLUORES SOUS LA FORME DE FIBRES OPTIQUES A PERMIS DE REALISER DES AMPLIFICATEURS OPTIQUES DE TRES BONNE QUALITE, L'EMPLOI DE TELS VERRES EN OPTIQUE INTEGREE PLANAIRE SEMBLE DONC TRES PROMETTEUR. DANS CE RAPPORT, NOUS PRESENTONS L'ETUDE QUE NOUS AVONS MENEE POUR REALISER DES GUIDES D'ONDES PAR ECHANGE D'IONS DANS DES SUBSTRAT DE VERRES FLUORES BIG ET ZBLA. POUR MENER A BIEN NOTRE TRAVAIL, NOUS AVONS MIS AU POINT UNE PROCEDURE TECHNOLOGIQUE PROPRE AUX VERRES FLUORES PUIS NOUS AVONS CARACTERISE LES GUIDES AINSI OBTENUS. L'UTILISATION D'UN ECHANGE ANIONIQUE OD/F A PERMIS D'OBTENIR LES PREMIER GUIDES D'ONDE MONOMODE EN OPTIQUE INTEGREE PLANAIRE SUR VERRE FLUORE. CEPENDANT, UNE OPTIMISATION DES PARAMETRES TECHNOLOGIQUES DE REALISATION DES GUIDES EST ENCORE NECESSAIRE POUR DIMINUER LES PERTES PAR PROPAGATION QUI SONT ENCORE DE L'ORDRE DE 3DB/CM. LA MESURE DES PROPRIETES SPECTROSCOPIQUES DES IONS ND#3#+ INCORPORES DANS LE VERRE A PERMIS DE DEMONTRER L'INFLUENCE NEFASTE DES IONS OD SUR LA DUREE DE VIE DU NIVEAU METASTABLE DES IONS ACTIFS PRESENTS DANS LE GUIDE. UNE SOLUTION A ETE PROPOSEE GRACE A L'UTILISATION D'IONS CI POUR REMPLACER LES IONS OD. D'APRES LES PREMIERS RESULTATS OBTENUS, LE COMPORTEMENT DES IONS ACTIFS EST MEILLEUR AVEC CE TYPE D'ECHANGE MAIS LES PERTES PAR PROPAGATION SONT ENCORE TROP ELEVEE POUR PERMETTRE DE REASLIER UN AMPLIFICATEUR OPTIQUE. FINALEMENT, POUR PERMETTRE DE REALISER DES AMPLIFICATEURS OPTIQUES PERFORMANTS ALLIANT DE FAIBLES PERTES A DE BONNES PERFORMANCES DES IONS DE TERRES RARES, NOUS AVONS PROPOSE ET DEMONTRE UNE STRUCTURE HYBRIDE ACTIVE-PASSIVE. CETTE STRUCTURE, COMPOSEE D'UN GUIDE PASSIF REALISE PAR ECHANGE D'IONS ET D'UNE COUCHE ACTIVE GUIDANTE, DEVRAIT PERMETTRE A TERME DE CONCILIER LES AVANTAGES DES TECHNOLOGIES DE TYPE COUCHES MINCES AVEC CEUX DES TECHNOLOGIES DE TYPE ECHANGES D'IONS.
Download or read book Etude de guides d ondes dopes terres rares en optique integree sur verre en vue de realiser un amplificateur optique written by Jean-Emmanuel Broquin and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Etude de photodetecteurs PIN GUIDE et MSM integre a un guide optique pour des applications en ondes millimetriques written by Omar Rabii and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book R alisation et tude de guides d ondes optiques plans en nitrure d aluminium par pulv risation magn tron r active written by Ibrahim Kadad and published by . This book was released on 1989 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le principe de la technique de dépôts d'ain pulvérisation magnétron réactive et les caractéristiques courant-tension de la machine sont développés. La propagation de la lumière est étudiée et la technique de spectroscopie des lignes noires pour la détermination des propriétés optiques est décrite. Les résultats concernant l'influence des paramètres de la décharge sur les propriétés des couches minces d'ain sont présentes
Download or read book tude du couplage entre une fibre optique et un guide d onde plan written by Martin Plante and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Shop Testing written by Daniel Malacara and published by John Wiley & Sons. This book was released on 2007-07-16 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this third edition is to bring together in a single book descriptions of all tests carried out in the optical shop that are applicable to optical components and systems. This book is intended for the specialist as well as the non-specialist engaged in optical shop testing. There is currently a great deal of research being done in optical engineering. Making this new edition very timely.
Download or read book Microwave Scanning Antennas Apertures written by Robert C. Hansen and published by . This book was released on 1964 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Education Research in the Knowledge Based Society written by Dimitris Psillos and published by Springer Science & Business Media. This book was released on 2003-08-31 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a global presentation of issues under study for improving science education research in the context of the knowledge-based society at a European and international level. It includes discussions of several theoretical approaches, research overviews, research methodologies, and the teaching and learning of science. It is based on papers presented at the Third International Conference of the European Science Education Research Association (Thessaloniki, Greece, August 2001).
Download or read book Acoustics of Porous Media written by Thierry Bourbié and published by Editions TECHNIP. This book was released on 1987 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
Download or read book Adhesion Between Polymers and Concrete Adh sion Entre Polym res Et B ton written by H. R. Sasse and published by Springer. This book was released on 1986 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
Download or read book Educational Planning written by Jacques Hallak and published by Routledge. This book was released on 2018-10-24 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1995. Routledge is an imprint of Taylor & Francis, an informa company.
Download or read book Electromagnetic Seabed Logging written by Stéphane Sainson and published by Springer. This book was released on 2017-03-30 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seabed logging (SBL) gathers the electromagnetic methods of marine subsoil exploration and more specifically those dedicated to the exploration of oil and gas at sea. Appeared in 2000, these techniques, with more than 500 industrial jobs, present after 15 years of commercial success a discovery record rate of nearly 90 % and seem now to turn the world in the offshore exploration field. Proposing a serious index of the presence of hydrocarbons , electromagnetic SBL coupled with seismic reflection survey is probably the first reliable method for direct detection of hydrocarbons. Complementing the structural concepts of oil exploration used since the 1920s, the SBL now radically modifies the approach and the philosophies of exploration especially those then including drilling and well logging activities. Electromagnetic Seabed Logging: a new tool for oil and gas prospecting, which original publication in French was in 2012, presents these methods, its principles, advantages, limitations, instruments, modeling and applications. It is also designed to be a tool for a reflection on the use of electromagnetic energy for the exploration in a conductive medium as sea water thus setting the theoretical and practical limits of these investigations for future developments. This book is intended of course for the geophysicists and the petroleum geologists, but also for the earth scientists, the reservoir engineers and the log analysts
