ETUDE ET REALISATION D'ELEMENTS DE MICRO-OPTIQUE POUR LA STABILISATION DE MICRO-CAVITES LASER PDF Download
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Author: VERONIQUE.. TARAZONA SCAGLIA
Publisher:
ISBN:
Category :
Languages : fr
Pages : 218
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Book Description
LES MICROLASERS SOLIDES A CAVITES A FACES PLANES ET PARALLELES PRESENTENT DES SEUILS ASSEZ ELEVES. EN EFFET LES CAVITES DE CES LASERS SONT STABILISEES UNIQUEMENT PAR DES EFFETS THERMIQUES DANS LE CRISTAL, INDUITS PAR LE FAISCEAU DE POMPE. LE BUT DE CETTE THESE ETAIT DE REALISER DES MICRO-MIROIRS SPHERIQUES SUR L'UNE DES FACES DU MICROLASER, AFIN QUE LA CAVITE SOIT GEOMETRIQUEMENT STABLE EN L'ABSENCE D'ECHAUFFEMENT DU A LA POMPE. NOUS AVONS AINSI ETUDIE DEUX METHODES DE FABRICATION COLLECTIVE DE MICROLENTILLES, METHODES ISSUES DE TECHNOLOGIES UTILISEES EN MICRO-ELECTRONIQUE. DES PREFORMES SPHERIQUES SONT TOUT D'ABORD REALISEES EN RESINE PHOTOSENSIBLE A LA SURFACE DU MATERIAU ACTIF, SOIT PAR FUSION DE CYLINDRES DE RESINE, SOIT PAR INSOLATION VARIABLE DE CELLE-CI A TRAVERS UN MASQUE A DENSITES VARIABLES. NOUS AVONS ENSUITE TRANSFERE CES FORMES DANS LE MATERIAU D'INTERET, PAR GRAVURE SIMULTANEE DE LA RESINE ET DU SUBSTRAT. APRES DEPOT DE MIROIRS DIELECTRIQUES, DES CENTAINES DE MICROLASERS A CAVITE STABLE SONT OBTENUS SUR UNE PLAQUE. L'ETUDE DU FONCTIONNEMENT LASER (SEUIL, RENDEMENT, DIVERGENCE) DE MICROLASERS CONTINUS OU DECLENCHES PASSIVEMENT PAR ABSORBANT SATURABLE A PU ETRE MENEE DANS LE CAS D'UN POMPAGE PAR UN LASER SAPHIR-TITANE. LE SEUIL OBTENU AVEC LES MICROLASERS A CAVITE STABLE EST REDUIT D'UN FACTEUR 5 A 20 PAR RAPPORT AUX MICROLASERS PLAN-PLANS. NOUS AVONS EGALEMENT MONTRE ET PROUVE EXPERIMENTALEMENT QUE LES EFFETS THERMIQUES DANS DE TELLES CAVITES STABLES SONT NEGLIGEABLES, ET QUE LE MODE GAUSSIEN FONDAMENTAL DE LA CAVITE EST EFFECTIVEMENT IMPOSE PAR LA GEOMETRIE DE CELLE-CI
Author: VERONIQUE.. TARAZONA SCAGLIA
Publisher:
ISBN:
Category :
Languages : fr
Pages : 218
Get Book Here
Book Description
LES MICROLASERS SOLIDES A CAVITES A FACES PLANES ET PARALLELES PRESENTENT DES SEUILS ASSEZ ELEVES. EN EFFET LES CAVITES DE CES LASERS SONT STABILISEES UNIQUEMENT PAR DES EFFETS THERMIQUES DANS LE CRISTAL, INDUITS PAR LE FAISCEAU DE POMPE. LE BUT DE CETTE THESE ETAIT DE REALISER DES MICRO-MIROIRS SPHERIQUES SUR L'UNE DES FACES DU MICROLASER, AFIN QUE LA CAVITE SOIT GEOMETRIQUEMENT STABLE EN L'ABSENCE D'ECHAUFFEMENT DU A LA POMPE. NOUS AVONS AINSI ETUDIE DEUX METHODES DE FABRICATION COLLECTIVE DE MICROLENTILLES, METHODES ISSUES DE TECHNOLOGIES UTILISEES EN MICRO-ELECTRONIQUE. DES PREFORMES SPHERIQUES SONT TOUT D'ABORD REALISEES EN RESINE PHOTOSENSIBLE A LA SURFACE DU MATERIAU ACTIF, SOIT PAR FUSION DE CYLINDRES DE RESINE, SOIT PAR INSOLATION VARIABLE DE CELLE-CI A TRAVERS UN MASQUE A DENSITES VARIABLES. NOUS AVONS ENSUITE TRANSFERE CES FORMES DANS LE MATERIAU D'INTERET, PAR GRAVURE SIMULTANEE DE LA RESINE ET DU SUBSTRAT. APRES DEPOT DE MIROIRS DIELECTRIQUES, DES CENTAINES DE MICROLASERS A CAVITE STABLE SONT OBTENUS SUR UNE PLAQUE. L'ETUDE DU FONCTIONNEMENT LASER (SEUIL, RENDEMENT, DIVERGENCE) DE MICROLASERS CONTINUS OU DECLENCHES PASSIVEMENT PAR ABSORBANT SATURABLE A PU ETRE MENEE DANS LE CAS D'UN POMPAGE PAR UN LASER SAPHIR-TITANE. LE SEUIL OBTENU AVEC LES MICROLASERS A CAVITE STABLE EST REDUIT D'UN FACTEUR 5 A 20 PAR RAPPORT AUX MICROLASERS PLAN-PLANS. NOUS AVONS EGALEMENT MONTRE ET PROUVE EXPERIMENTALEMENT QUE LES EFFETS THERMIQUES DANS DE TELLES CAVITES STABLES SONT NEGLIGEABLES, ET QUE LE MODE GAUSSIEN FONDAMENTAL DE LA CAVITE EST EFFECTIVEMENT IMPOSE PAR LA GEOMETRIE DE CELLE-CI
Author: Grigore Gogu
Publisher: Springer Science & Business Media
ISBN: 940170161X
Category : Technology & Engineering
Languages : en
Pages : 541
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Book Description
This book presents recent advances in the integration and the optimization of product design and manufacturing systems. The book is divided into 3 chapters corresponding to the following three main topics : - optimization of product design process (mechanical design process, mass customization, modeling the product representation, computer support for engineering design, support systems for tolerancing, simulation and optimization tools for structures and for mechanisms and robots), -optimization of manufacturing systems (multi-criteria optimization and fuzzy volumes, tooth path generation, machine-tools behavior, surface integrity and precision, process simulation), - methodological aspects of integrated design and manufacturing (solid modeling, collaborative tools and knowledge formalization, integrating product and process design and innovation, robust and reliable design, multi-agent approach in VR environment). The present book is of interest to engineers, researchers, academic staff, and postgraduate students interested in integrated design and manufacturing in mechanical engineering.
Author: Jean-Louis Barrat
Publisher: Cambridge University Press
ISBN: 9780521789530
Category : Science
Languages : en
Pages : 410
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Book Description
Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Publisher:
ISBN: 9789283600046
Category : Aeronautics
Languages : en
Pages :
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Book Description
Author: Preetha Balakrishnan
Publisher: Woodhead Publishing
ISBN: 0081022069
Category : Technology & Engineering
Languages : en
Pages : 466
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Book Description
Fundamental Biomaterials: Metals provides current information on the development of metals and their conversion from base materials to medical devices. Chapters analyze the properties of metals and discuss a range of biomedical applications, with a focus on orthopedics. While the book will be of great use to researchers and professionals in the development stages of design for more appropriate target materials, it will also help medical researchers understand, and more effectively communicate, the requirements for a specific application. With the recent introduction of a number of interdisciplinary bio-related undergraduate and graduate programs, this book will be an appropriate reference volume for students. It represents the second volume in a three volume set, each of which reviews the most important and commonly used classes of biomaterials, providing comprehensive information on materials properties, behavior, biocompatibility and applications. - Provides current information on metals and their conversion from base materials to medical devices - Includes analyses of types of metals, discussion of a range of biomedical applications, and essential information on corrosion, degradation and wear and lifetime prediction of metal biomaterials - Explores both theoretical and practical aspects of metals in biomaterials
Author: J. D. Van Der Waals
Publisher: Courier Corporation
ISBN: 9780486495934
Category : Science
Languages : en
Pages : 336
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Book Description
This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.
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: A.S. Marfunin
Publisher: Springer
ISBN: 9783540572541
Category : Science
Languages : en
Pages : 588
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Book Description
All existing introductory reviews of mineralogy are written accord ing to the same algorithm, sometimes called the "Dana System of Mineralogy". Even modern advanced handbooks, which are cer tainly necessary, include basic data on minerals and are essentially descriptive. When basic information on the chemistry, structure, optical and physical properties, distinguished features and para genesis of 200-400 minerals is presented, then there is practically no further space available to include new ideas and concepts based on recent mineral studies. A possible solution to this dilemma would be to present a book beginning where introductory textbooks end for those already famil iar with the elementary concepts. Such a volume would be tailored to specialists in all fields of science and industry, interested in the most recent results in mineralogy. This approach may be called Advanced Mineralogy. Here, an attempt has been made to survey the current possibilities and aims in mineral matter investigations, including the main characteristics of all the methods, the most important problems and topics of mineral ogy, and related studies. The individual volumes are composed of short, condensed chap ters. Each chapter presents in a complete, albeit condensed, form specific problems, methods, theories, and directions of investigations, and estimates their importance and strategic position in science and industry.
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: Kaiser Engineers
Publisher:
ISBN:
Category : Nuclear power plants
Languages : en
Pages : 140
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Book Description
