Download or read book Etude des sources supercontinuum fibres transparentes dans le moyen infra rouge written by Mathieu Duhant and published by . This book was released on 2012 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux réalisés dans ce manuscrit portent sur l'étude de la génération de supercontinuum dans des fibres transparentes dans le moyen infrarouge. Afin de générer un supercontinuum entre 3 et 5 μm, nous chercherons à comparer différentes familles de verres tels que les verres de fluorures, les verres d'oxydes de tellures et les verres de chalcogénures. Ces fibres sont pompées à l'aide de laser à fibre émettant autour de 2 μm en régime impulsionnel nanoseconde ou picoseconde. Cette longueur d'onde permet de s'approcher du zéro de dispersion chromatique de certaines fibres. Nous générons un supercontinuum jusqu'à 3800 nm dans des verres fluorés. Une connectique, dont la transmission est d'environ 75 %, est réalisée entre une fibre ZBLAN et une fibre SiO2. Une mesure des raies d'absorption du méthane est réalisée autour de 3300 nm à l'aide du supercontinuum généré dans les verres fluorés. Un supercontinuum est généré jusqu'à 2900 nm dans une fibre en oxyde de tellure. L'étendue du spectre aux grandes longueurs d'onde est limitée par l'atténuation de la fibre. Enfin, plusieurs compositions de verres de chalcogénures sont testées (As38Se62, As40S60, Ge10As22Se68). Ces fibres seront tout d'abord pompées dans leur régime de dispersion normale et nous observerons la formation de 4 sauts Raman successifs. Le gain Raman dans les verres AsSe est estimé à (1,6+/- 0,5) x 10E-11 m/W. Un compromis entre le contrôle de la dispersion chromatique et le couplage dans la fibre nous conduit à réaliser des fibres effilées dont le diamètre varie sur la longueur de la fibre. Nous obtiendrons alors un supercontinuum dans une fibre effilée en verre d'AsSe jusqu'à 2600 nm

Download or read book G n ration de supercontinuum dans le moyen infrarouge l aide de fibres optiques written by Nicolas Ducros and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse est l'étude et le développement de sources lumineuses, émettant dans le moyen infrarouge (2 μm

Download or read book Fibres chalcog nures et tellurites supercontinuum moyen infrarouge pour capteurs optiques written by Arnaud Lemière and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce mémoire rapporte les progrès réalisés durant mon doctorat concernant la génération de supercontinuum et son application suivant deux types de matériaux : les verres de chalcogénures et les verres de tellurite. Concernant l'axe chalcogénure, deux nouvelles compositions exemptes d'arsenic sont développées : Ge20Se60Te20 et Ge20Se70Te10. Les propriétés thermiques et optiques de ces deux compositions de verres sont étudiées et deux types de fibres sont fabriqués : des fibres optiques double indices et des fibres optiques à cœur suspendu. La génération de supercontinuum dans ces deux types de fibres pompées par un amplificateur paramétrique optique rapporte des résultats compétitifs avec l'état de l'art actuel de la génération de supercontinuum dans les fibres chalcogénures, et permettent de générer des spectres continus entre 2 et 14 μm. Concernant l'axe tellurite, lessupercontinuums générés confirment les résultats précédents obtenus avec ce type de fibre optique. Différents types de pompage sont alors étudiés en lien avec la cohérence du supercontinuum et en fonction du régime de dispersion de la fibre, notamment lorsque le pompage est de faible puissance. L'impact du type de source laser à l'origine du supercontinuum est également étudié. Les supercontinuums jusqu'alors générés par un pompage de type oscillateur paramétrique optique peuvent désormais être obtenus par pompage avec de nouvelles sources laser compactes femtoseconde récemment développées vers 2 μm et disponibles commercialement. Les supercontinuums obtenus sont utilisés dans diverses expériences de spectroscopie d'absorption supercontinuum, notamment en.

Download or read book Design Simulations Et Exp riences de G n ration de Supercontinuum Dans L infrarouge Moyen Dans Des Fibres Cristaux Phoniques en Verre Souple written by Amar Nath Ghosh and published by . This book was released on 2020 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This doctoral thesis, funded within the framework of a European Marie-Curie H2020 SUPUVIR project, focuses on the design and fabrication of new photonic crystal fibers from infrared soft glasses making it possible to produce a wide emission spectrum in the mid-infrared (IR) wavelength region through generation of supercontinuum (SC). Applications of mid-IR SC sources cover infrared spectroscopy, optical detection of chemical and molecular species, materials processing, and biomedical imaging. An alternative to conventional thermal light sources, mid-IR sources have broad spectral bandwidth like a lamp or Globar and high brightness, which is more than 20 times of the sun focussed in a small spot similar to a laser. Several optical fibers with different photonic structures and different soft glasses have been produced and studied. In collaboration with the Institute of Electronic Materials Technology in Warsaw, heavy metal-oxide glass (PBG81) microstructured fibers were first developed and with these fibers we demonstrated the efficient generation of SC from 0.89 to 2.5 μm, limited by the absorption of the glass. Then, in partnership with the University of Rennes and the Technical University of Denmark, we fabricated microstructured fibers based on chalcogenide glasses (As38Se62) with polarization-maintaining property. These fibers have made it possible to generate a linearly polarized 3.1 to 6 μm supercontinuum. SC bandwidth was further extended between 1 μm and 7.4 μm in taper fibers produced from Ge10As22Se68 glass. The laser power handling capacities of these chalcogenide fibers were also analyzed. Finally, we have developed a compact mid-IR SC system using a fiber cascade comprising of silica, fluoride, and chalcogenide fiber, pumped by a fiber laser at 1.55 μm, and making it possible to extend the emission range from 2 to 10 μm. This research work thus constitutes an important step towards the development of stable and compact fiber SC sources for various applications in the mid-infrared.

Download or read book G n ration de supercontinuum dans l infrarouge en r gime nanoseconde written by Philippe Gagné and published by . This book was released on 2011 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: La génération de supercontinuum consiste en un élargissement spectral extrême d'une source laser généralement pulsée par l'intermédiaire des effets non-linéaires. Une fibre optique est le plus souvent utilisée vu l'excellent confinement qu'offre ce type de milieu. La génération de supercontinuum trouve des applications dans de nombreux domaines que ce soit en spectroscopie, en métrologie, ou même en médecine. Depuis plusieurs années de nombreuses recherches ont été conduites visant à repousser les limites de l'élargissement. Pour pallier à la limite fondamentale que représente les pertes matérielles dans l'infrarouge de la silice, plusieurs se sont tournés vers des verres plus exotiques tels que les verres fluorés [?,?,?]; et les verres de chalcogénure [?,?,?]. Le but principal de ce mémoire est d'étudier en profondeur la génération de supercontinuum dans l'infrarouge à partir d'impulsions nanosecondes dans des fibres de verre fluoré. Ce mémoire présente premièrement les concepts théoriques derrière les effets non-linéaires menant à la génération de supercontinuum. Ensuite, on y décrit les méthodes utilisées pour caractériser et les propriétés importantes des fibres optiques utilisées. Finalement, les différents supercontinua générés sont présentés et les mécanismes menant à l'élargissement spectral sont analysés.

Download or read book G n ration de supercontinuum dans l infrarouge moyen partir de fibres optiques saut d indice written by Louis-Rafaël Robichaud and published by . This book was released on 2020 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book G n ration de supercontinuum en r gime femtoseconde dans l infrarouge moyen dans des fibres optiques written by Olivier Thibault-Maheu and published by . This book was released on 2015 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fluoride Glass Fiber Optics written by Ishwar D. Aggarwal and published by Academic Press. This book was released on 2013-10-22 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluoride Glass Fiber Optics reviews the fundamental aspects of fluoride glasses. This book is divided into nine chapters. Chapter 1 discusses the wide range of fluoride glasses with an emphasis on fluorozirconate-based compositions. The structure of simple fluoride systems, such as BaF2 binary glass is elaborated in Chapter 2. The third chapter covers the intrinsic transparency of fluoride glasses from the UV to the IR, with particular emphasis on the multiphonon edge and electronic edge. The next three chapters are devoted to ultra-low loss optical fibers, reviewing methods for purifying and analyzing the fluoride glass raw materials. The sources of loss are considered in Chapter 6, while the work performed on the durability of fluoride glasses is analyzed in Chapter 7. Chapter 8 focuses on the effects of radiation on fluoride glasses. The last chapter deliberates the area of active phenomena such as doping of fluoride glasses with rare-earth elements for fluorescence and lasing, as well as frequency doubling. This publication is a good reference for students and researchers conducting work on fluoride glasses.

Download or read book Laser Refrigeration of Solids II written by Richard I. Epstein and published by Society of Photo Optical. This book was released on 2009-01-01 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821

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 Diffusion in Materials DIMAT 2011 written by I. Bezverkhyy and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools.Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.

Download or read book Semiconductor Disk Lasers written by Oleg G. Okhotnikov and published by John Wiley & Sons. This book was released on 2010-03-30 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely publication presents a review of the most recent developments in the field of Semiconductor Disk Lasers. Covering a wide range of key topics, such as operating principles, thermal management, nonlinear frequency conversion, semiconductor materials, short pulse generation, electrical pumping, and laser applications, the book provides readers with a comprehensive account of the fundamentals and latest advances in this rich and diverse field. In so doing, it brings together contributions from world experts at major collaborative research centers in Europe and the USA. Each chapter includes a tutorial style introduction to the selected topic suitable for postgraduate students and scientists with a basic background in optics - making it of interest to a wide range of scientists, researchers, engineers and physicists working and interested in this rapidly developing field. It will also serve as additional reading for students in the field.

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.

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.

Download or read book Medical Thermology written by Margaret Abernathy and published by . This book was released on 1986 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lock in Thermography written by Otwin Breitenstein and published by Springer Science & Business Media. This book was released on 2010-09-05 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book on lock-in thermography, an analytical method applied to the diagnosis of microelectronic devices. This useful introduction and guide reviews various experimental approaches to lock-in thermography, with special emphasis on the lock-in IR thermography developed by the authors themselves.