Download or read book R alisation d une source accordable dans l infrarouge lointain written by Gérard Pascal Piau and published by . This book was released on 1986 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mélange non linéaire, sur une diode Schottky, du rayonnement issu d'un laser infrarouge lointain et d'un rayonnement de fréquence accordable entre 2 et 4 GHz

Download or read book Mise en op ration d une source picoseconde de rayonnement infrarouge lointain ressource lectronique written by Rivière, Christophe and published by Québec : Université Laval. This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Les propriétés non linéaires des matériaux dans la gamme infrarouge lointain ont été relativement peu étudiées. Ce phénomène est dû à l'absence, jusqu'à tout récemment, de sources dans cette gamme qui soient à la fois cohérentes et intenses. Certains lasers moléculaires et les lasers à électrons libres ont permis de pallier ce manque. Cependant ces sources sont soit difficilement accordables, soit très onéreuses et volumineuses. Nous présentons ici une source dite optoélectronique qui est cohérente, potentiellement accordable entre 17 et 600 æm, intense, peu volumineuse et peu coûteuse. La première partie du projet a consisté à développer l'aspect d'accordabilité de la source au moyen du battement entre deux faisceaux laser. Nous avons montré qu'une méthode de réinjection de photons cohérents permettait d'augmenter significativement le contraste de battements de fréquence entre 0.5 et plus de 15 THz. Ces battements ont ensuite été amplifiés et utilisés pour générer un rayonnement infrarouge lointain à 180 et 510 æm avec une énergie de 0.4 æJ.

Download or read book GENERATION D INFRAROUGE LOINTAIN ACCORDABLE DANS LES HYDRACIDES written by Antonello De Martino and published by . This book was released on 1979 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: GENERATION OBTENUE PAR DIFFUSION RAMAN STIMULEE D'UNE SOURCE ELLE-MEME ACCORDABLE EN FREQUENCE. ETUDE THEORIQUE: CALCUL DU GAIN RAMAN QUASI RESONNANT, ETUDE DU CAS D'UNE MOLECULE DIATOMIQUE POLAIRE. APPLICATION NUMERIQUE A HF. INFLUENCE DES TRANSITIONS A UN PHOTON. REALISATION EXPERIMENTALE: ETUDE DE LA DIFFUSION RAMAN STIMULEE DANS HF DANS DES GUIDES ONDES CIRCULAIRES CREUX DE DIAMETRE, LONGUEURS, NATURES DIVERSES. RESULTAT: HF EST DE TOUS LES HYDRACIDES LE MEILLEUR "CANDIDAT" POUR COUVRIR UNE PART IMPORTANTE DU SPECTRE ENTRE 30 ET 300 MU . PUISSANCE ATTEIGNANT 300 KW

Download or read book Mise en op ration d une source picoseconde de rayonnement infrarouge lointain microforme written by Christophe Rivière and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1999 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book R alisation d un Interf rom tre pour l infrarouge lointain embarqu en avion et application de la Spectroscopie Solaire written by Michel Charles and published by . This book was released on 1974 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conception mod lisation et r alisation d une source coh rente de forte nergie accordable dans le moyen infrarouge written by Gabriel Mennerat and published by . This book was released on 2000 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse expérimentale et théorique est consacrée à la conversion de fréquences optiques à forte énergie en régime impulsionnel nanoseconde pour l’émission d’un faisceau spectralement fin dans la bande 2-22 μm. Une étude bibliographique approfondie et une analyse globale ont abouti à la réalisation d’un système comportant un oscillateur paramétrique optique (OPO) suivi d’un étage à différence de fréquences. Pompé à 1,06 μm par un laser à YAG :Nd déclenché à la cadence de 10Hz, cet OPO, basé sur un cristal non-linéaire de niobate de lithium (LiNbO3) ou de KTP (KTiOPO4) et muni d’éléments d’affinement spectral intracavité, émet deux ondes accordables entre 1,8 et 2,6 μm. Les énergies maximales produites vers 2 μm en sortie d’OPO sont d’environ 500 mJ sans affinement spectral (soit un rendement proche de 50%) et comprises entre 100 et 350 mJ selon la finesse spectrale désirée (5 à 30GHz). Ces deux ondes sont à leur tour converties dans un étage mélangeur soustractif de fréquences à cristaux semiconducteurs de séléniure de cadmium (CdSe), de séléniure de gallium (GaSe), de TAS (TL3AsSe3) et de sélénogallate d’argent (AgGaSe2). Des impulsions d’énergie comprises entre 10 et 2 mJ ont été obtenues dans la bande 10-22 μm dans le CdSe. Les cristaux de GaSe nous ont permis de produire jusqu’à 1,5 mJ entre 6 et 19,2 μm. Nous avons aussi effectué la première démonstration de conversion paramétrique de fréquences dans le TAS en émettant une onde continûment accordable de 6,5 à 12 μm. Un code de simulation numérique d’OPO nanosecondes à spectre large a été réalisé en tenant compte des phénomènes physiques de diffraction anisotrope, de double réfraction, d’absorption et de polarisation non-linéaire quadratique. Confronté aux caractérisations énergétiques, spectrales, temporelles et spatiales des trois ondes générées, ce code nous a permis de mettre en évidence des effets d’absorption non-linéaire dans les cristaux mélangeurs.

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.

Download or read book III Nitride Semiconductors written by M.O. Manasreh and published by Elsevier. This book was released on 2000-12-06 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research advances in III-nitride semiconductor materials and device have led to an exponential increase in activity directed towards electronic and optoelectronic applications. There is also great scientific interest in this class of materials because they appear to form the first semiconductor system in which extended defects do not severely affect the optical properties of devices. The volume consists of chapters written by a number of leading researchers in nitride materials and device technology with the emphasis on the dopants incorporations, impurities identifications, defects engineering, defects characterization, ion implantation, irradiation-induced defects, residual stress, structural defects and phonon confinement. This unique volume provides a comprehensive review and introduction of defects and structural properties of GaN and related compounds for newcomers to the field and stimulus to further advances for experienced researchers. Given the current level of interest and research activity directed towards nitride materials and devices, the publication of the volume is particularly timely. Early pioneering work by Pankove and co-workers in the 1970s yielded a metal-insulator-semiconductor GaN light-emitting diode (LED), but the difficulty of producing p-type GaN precluded much further effort. The current level of activity in nitride semiconductors was inspired largely by the results of Akasaki and co-workers and of Nakamura and co-workers in the late 1980s and early 1990s in the development of p-type doping in GaN and the demonstration of nitride-based LEDs at visible wavelengths. These advances were followed by the successful fabrication and commercialization of nitride blue laser diodes by Nakamura et al at Nichia. The chapters contained in this volume constitutes a mere sampling of the broad range of research on nitride semiconductor materials and defect issues currently being pursued in academic, government, and industrial laboratories worldwide.

Download or read book An Introduction To Plasmonics written by Olivier Pluchery and published by World Scientific. This book was released on 2023-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Laser Focus with Fiberoptic Technology written by and published by . This book was released on 1983 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of the Optical Society of America written by Optical Society of America and published by . This book was released on 1981 with total page 438 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 Optics Index written by and published by . This book was released on 1974 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optics Letters written by and published by . This book was released on 1977 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Radiation Heat Transfer The blackbody electromagnetic theory and material properties written by Robert Siegel and published by . This book was released on 1968 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Critical Technologies Plan written by and published by . This book was released on 1989 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Routledge International Handbook of Ignorance Studies written by Matthias Gross and published by Routledge. This book was released on 2015-05-15 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once treated as the absence of knowledge, ignorance today has become a highly influential topic in its own right, commanding growing attention across the natural and social sciences where a wide range of scholars have begun to explore the social life and political issues involved in the distribution and strategic use of not knowing. The field is growing fast and this handbook reflects this interdisciplinary field of study by drawing contributions from economics, sociology, history, philosophy, cultural studies, anthropology, feminist studies, and related fields in order to serve as a seminal guide to the political, legal and social uses of ignorance in social and political life. Chapter 33 of this book is freely available as a downloadable Open Access PDF under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license available here: https://tandfbis.s3-us-west-2.amazonaws.com/rt-files/docs/Open+Access+Chapters/9780415718967_oachapter33.pdf