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Author: Florent Gardillou
Publisher:
ISBN:
Category :
Languages : fr
Pages : 152
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Book Description
Les avancées majeures des télécommunications optiques ont nécessité l'élaboration de circuits intégrés optiques (ClOs) pour émettre, recevoir, traiter et distribuer l'information. Historiquement, de nombreuses technologies de ClOs ont été développées en parallèle. Cependant, dans le but de réduire les dimensions et les coûts des futurs ClOs, il est nécessaire de pouvoir intégrer plusieurs fonctions élémentaires sur un même substrat Pour cela, nous avons étudié la possibilité de réaliser des structures hybrides sur verre composées d'une couche mince guidante de matériau actif ou passif reporté sur un guide d'ondes de surface réalisé par échange d'ions. Nous nous sommes particulièrement intéressés à la réalisation d'un amplificateur. optique hybride grâce à la mise au point d'une technique de collage par adhésion moléculaire d'un verre silicate contenant des guides d'ondes .et d'un verre phosphate codopé Er3+/Yb3+. Pour cela, nous avons développé un procédé d'échange d'ions T1+/K+ laissant la surface du verre intacte, un procédé de collage à basse température ainsi qu'une technique d'amincissement permettant de réduire l'épaisseur du verre actif à moins de 10μm. Un amplificateur hybride a été réalisé et un coefficient de gain de 3,66 dB/cm a été obtenu, ce qui est comparable aux meilleures performances publiées pour des amplificateurs classiques réalisés par échange d'ions. Un gain net positif a même été démontré dans un autre amplificateur hybride réalisé par un échange d'ions Ag+/Na+ et aminci par rodage/polissage. La réalisation d'autres fonctions en configuration hybride (encapsulation d'un réseau de Bragg, isolateur optique) a ensuite été étudiée.
Author: Florent Gardillou
Publisher:
ISBN:
Category :
Languages : fr
Pages : 152
Get Book Here
Book Description
Les avancées majeures des télécommunications optiques ont nécessité l'élaboration de circuits intégrés optiques (ClOs) pour émettre, recevoir, traiter et distribuer l'information. Historiquement, de nombreuses technologies de ClOs ont été développées en parallèle. Cependant, dans le but de réduire les dimensions et les coûts des futurs ClOs, il est nécessaire de pouvoir intégrer plusieurs fonctions élémentaires sur un même substrat Pour cela, nous avons étudié la possibilité de réaliser des structures hybrides sur verre composées d'une couche mince guidante de matériau actif ou passif reporté sur un guide d'ondes de surface réalisé par échange d'ions. Nous nous sommes particulièrement intéressés à la réalisation d'un amplificateur. optique hybride grâce à la mise au point d'une technique de collage par adhésion moléculaire d'un verre silicate contenant des guides d'ondes .et d'un verre phosphate codopé Er3+/Yb3+. Pour cela, nous avons développé un procédé d'échange d'ions T1+/K+ laissant la surface du verre intacte, un procédé de collage à basse température ainsi qu'une technique d'amincissement permettant de réduire l'épaisseur du verre actif à moins de 10μm. Un amplificateur hybride a été réalisé et un coefficient de gain de 3,66 dB/cm a été obtenu, ce qui est comparable aux meilleures performances publiées pour des amplificateurs classiques réalisés par échange d'ions. Un gain net positif a même été démontré dans un autre amplificateur hybride réalisé par un échange d'ions Ag+/Na+ et aminci par rodage/polissage. La réalisation d'autres fonctions en configuration hybride (encapsulation d'un réseau de Bragg, isolateur optique) a ensuite été étudiée.
Author: Leslie Rainer
Publisher: Getty Publications
ISBN: 1606060430
Category : Architecture
Languages : fr
Pages : 438
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Book Description
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Author: Patrick Chedmail
Publisher: Springer
ISBN: 9789401063562
Category : Technology & Engineering
Languages : en
Pages : 545
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Book Description
This volume contains the selected papers of the first I.D.M.M.E. conference on 'Integrated Design and Manufacturing in Mechanical Engineering', held in Nantes from 15-17 April 1996. Its objective was to discuss the questions related to the definition of the optimal design and manufacturing processes and to their integration through coherent methodologies in adapted environments. The initiative of the Conference and the organization thereof, is mainly due to the efforts of the french PRIMECA group (Pool of Computer Resources for Mechanics) started eight years ago. We were able to attract the internationru community with the support of the International Institution for Production Engineering Research (C.I.R.P.). The conference brought together two hundred and fifty specialists from around the world. About ninety papers and twenty posters were presented covering three main topics : optimization and evaluation of the product design process, optimization and evaluation of the manufacturing systems and methodological aspects.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
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.
Author: Davide Bucci
Publisher: John Wiley & Sons
ISBN: 1786301482
Category : Technology & Engineering
Languages : en
Pages : 180
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Book Description
Many instrumentation engineers and scientists often deal with analog electronic issues when approaching delicate measurements. Even if off-the-shelf measuring solutions exist, comprehension of the analog behavior of the measuring system is often a necessity. This book provides a concise introduction to the main elements of a low frequency analog acquisition chain. It aims to be sufficiently general to provide an introduction, yet specific enough to guide the reader through some classical problems that may be encountered in the subject. Topics include sensors, conditioning circuits, differential and instrumentation amplifiers, active filters (mainly for anti-aliasing purposes) and analog to digital converters. A chapter is devoted to an introduction to noise and electronic compatibility. This work is intended for people with a general background in electronics and signal processing, who are looking for an introduction to classical electronic solutions employed in measuring instruments involving low frequency analog signal processing.
Author: Olivier Pluchery
Publisher: World Scientific
ISBN: 1800613415
Category : Science
Languages : en
Pages : 356
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Book Description
What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.
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: Wolfgang Demtröder
Publisher: Springer
ISBN: 3642538592
Category : Science
Languages : en
Pages : 510
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Book Description
Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., ultrafast lasers (atto- and femtosecond lasers) and parametric oscillators, coherent matter waves, Doppler-free Fourier spectroscopy with optical frequency combs, interference spectroscopy, quantum optics, the interferometric detection of gravitational waves and still more applications in chemical analysis, medical diagnostics, and engineering.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
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.
