Propagation Non Lineaire Dimpulsions Laser Ultra Courtes Dans Les Milieux Transparents

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Propagation non-linéaire d'impulsions laser ultra-courtes dans les milieux transparents

Author : Antoine Vinçotte
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (493 download)

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Book Synopsis Propagation non-linéaire d'impulsions laser ultra-courtes dans les milieux transparents by : Antoine Vinçotte

Download or read book Propagation non-linéaire d'impulsions laser ultra-courtes dans les milieux transparents written by Antoine Vinçotte and published by . This book was released on 2006 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous présentons différents aspects de la propagation d'impulsions laser ultra-courtes dans les milieux transparents. Tout d'abord, après avoir établi les équations de propagation à partir des équations de Maxwell, nous rappelons les principaux phénomènes physiques auxquels sont soumises les impulsions ultra-courtes et de forte puissance se propageant dans un milieu transparent. Celles-ci subissent de l'auto-focalisation causée par la réponse Kerr du milieu. Cette auto-focalisation est stoppée par la création d'un plasma produit par l'ionisation photonique des molécules du milieu. La propagation de l'onde laser génère aussi un supercontinuum par auto-modulation de phase. Enfin, on rappelle les principaux résultas concernant la filamentation simple ou multiple de l'onde provenant des inhomogénéités du faisceau et qui a lieu lorsque la puissance initiale du laser est supérieure au seuil d'auto-focalisation. Dans une deuxième partie, nous nous intéressons à l'influence de non-linéarités optique d'ordre élevé sur la propagation de l'onde et sur la figure de filamentation créés. Dans une troisième partie, afin de contrôler la fimalentaion multiple, nous analysons la propagation de faisceaux particuliers : les impulsions otiques femtosecondes avec gradient fort et les vortex. Nous justifions les propriétés de robustesse de ce derniers type d'objets optiques. Nous examinons la filamantation multiple d'impusions ultra-courtes à travers une chambre à brouillard, et dans les cellules d'éthanol dopées à la coumarine, pour différentes configurations du faisceau.

Propagation non-linéaire des impulsions laser femtosecondes dans la silice

Author : Lionel Sudrie
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (491 download)

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Book Synopsis Propagation non-linéaire des impulsions laser femtosecondes dans la silice by : Lionel Sudrie

Download or read book Propagation non-linéaire des impulsions laser femtosecondes dans la silice written by Lionel Sudrie and published by . This book was released on 2002 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objet de cette thèse est l'étude de la propagation des impulsions laser femtosecondes dans les solides transparents. La courte durée de ces impulsions (quelques 10-̂15 à quelques 10-̂13 s) fournit de hautes intensités lumineuses pour des énergies modestes. Lorsqu'elles traversent un milieu transparent, ces fortes intensités laser induisent des non-linéarités importantes qui affectent la propagation de l'impulsion. Ces non-linéarités peuvent conduire à une propagation auto-guidée des impulsions laser avec de hautes intensités sur de longues distances. Cette propagation est appelée filamentation laser. En focalisant des impulsions de 2 mJ, 160 fs et de longueur d'onde centrale 800 nm, j'ai formé une filamentation laser dans un échantillon de silice de 2 cm. L'étude expérimentale de cette propagation non-linéaire est la première caractérisation précise et complète d'un filament dans un milieu solide transparent. La comparaison des résultats expérimentaux à ceux d'un code numérique a permis de montrer que la filamentation laser peut avoir lieu dans les milieux solides de la même manière que dans les gaz. L'équilibre entre l'autofocalisation par effet Kerr et la défocalisation par le plasma est l'origine de la filamentation. La défocalisation limite l'intensité laser et évite l'endommagement de l'échantillon. Cette étroite relation entre propagation et endommagement m'a amené à considérer la propagation d'impulsions plus fortement focalisées à l'intérieur de la silice. Ce type de propagation conduit à des densités électroniques élevées qui induisent des dommages irréversibles. Le parallèle entre les résultats numériques et expérimentaux permet de préciser les conditions d'apparition des dommages tout en donnant des quantités physiques inaccessibles expérimentalement. J'ai aussi observé dans la silice un nouveau type de modifications avec une forte biréfringence. Comme application j'ai fabriqué des éléments optiques comme des guides d'onde et des réseaux de diffraction.

Filamentation d'impulsions laser ultra-courtes dans l'air et dans l'eau : étude des processus de transfert d'énergie

Author : Amélie Jarnac
Publisher :
ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (117 download)

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Book Synopsis Filamentation d'impulsions laser ultra-courtes dans l'air et dans l'eau : étude des processus de transfert d'énergie by : Amélie Jarnac

Download or read book Filamentation d'impulsions laser ultra-courtes dans l'air et dans l'eau : étude des processus de transfert d'énergie written by Amélie Jarnac and published by . This book was released on 2014 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le développement des chaines laser femtoseconde amplifiées a permis de mettre à la disposition des chercheurs des impulsions dont la puissance crête excède quelques Gigawatts. Dans ce régime de puissance, la propagation du faisceau laser est fortement non-linéaire. L'effet Kerr auto-focalise le faisceau qui s'effondre sur lui-même jusqu'à ce que l'intensité soit suffisante pour générer un plasma à effet défocalisant. La compétition dynamique entre l'effet Kerr, l'ionisation et la diffraction permet de conserver une intensité élevée dans le cœur du faisceau sur une grande distance. Dans ce processus, dit de filamentation, l'impulsion lumineuse laisse dans son sillage une mince colonne de plasma faiblement ionisé. Le phénomène de filamentation peut affecter fortement l'impulsion laser et le milieu dans lequel elle se propage. Par le biais de multiples collaborations, je me suis attachée au cours de cette thèse à étudier expérimentalement plusieurs effets liés à la propagation non-linéaire dans les gaz et dans les liquides. Ainsi j'ai réalisé une cartographie des déformations spatio-temporelles de l'impulsion au cours de sa propagation dans l'eau et mis en évidence leurs signatures dans le domaine spatial, spectral, et énergétique. J'ai ensuite caractérisé le dépôt d'énergie dans l'eau liquide et l'onde de choc induite par la relaxation du plasma dans différents régimes de puissance et de focalisation, dans le but d'analyser la génération d'ondes acoustiques par des impulsions laser femtoseconde. Par ailleurs, j'ai étudié le plasma formé à l'intersection de deux filaments dans différents gaz moléculaires et atomiques. J'ai mis en évidence que ses propriétés spatiales et transitoires permettent un filtrage spatio-temporel d'une impulsion incidente, ce qui pourrait constituer une nouvelle alternative aux techniques de filtrage d'impulsions femtoseconde. Enfin, j'ai caractérisé la compression d'impulsions énergétiques dans un guide plan creux et démontré que les impulsions comprimées temporellement pouvaient être utilisées pour la génération d'harmoniques d'ordres élevés, et plus généralement pour la physique de haute intensité.

Introduction to Biophotonics

Author : Paras N. Prasad
Publisher : John Wiley & Sons
ISBN 13 : 0471465399
Total Pages : 622 pages
Book Rating : 4.4/5 (714 download)

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Book Synopsis Introduction to Biophotonics by : Paras N. Prasad

Download or read book Introduction to Biophotonics written by Paras N. Prasad and published by John Wiley & Sons. This book was released on 2004-01-16 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paras Prasad’s text provides a basic knowledge of a broad range of topics so that individuals in all disciplines can rapidly acquire the minimal necessary background for research and development in biophotonics. Introduction to Biophotonics serves as both a textbook for education and training as well as a reference book that aids research and development of those areas integrating light, photonics, and biological systems. Each chapter contains a topic introduction, a review of key data, and description of future directions for technical innovation. Introduction to Biophotonics covers the basic principles of Optics Optical spectroscopy Microscopy Each section also includes illustrated examples and review questions to test and advance the reader’s knowledge. Sections on biosensors and chemosensors, important tools for combating biological and chemical terrorism, will be of particular interest to professionals in toxicology and other environmental disciplines. Introduction to Biophotonics proves a valuable reference for graduate students and researchers in engineering, chemistry, and the life sciences.

The Supercontinuum Laser Source

Author : Robert R. Alfano
Publisher : Springer Science & Business Media
ISBN 13 : 0387250972
Total Pages : 552 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis The Supercontinuum Laser Source by : Robert R. Alfano

Download or read book The Supercontinuum Laser Source written by Robert R. Alfano and published by Springer Science & Business Media. This book was released on 2006-02-14 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of a classic in the field has been expanded and enriched with new content and updated references. The book covers the fundamental principles and surveys research of current thinkers and experts in the field with updated references of the key breakthroughs over the past decade and a half.

Quantum Mechanics, Volume 3

Author : Claude Cohen-Tannoudji
Publisher : John Wiley & Sons
ISBN 13 : 3527345558
Total Pages : 790 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji

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.

Dictionary of Building and Civil Engineering

Author : Don Montague
Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)

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Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Solid Propellant Rocket Research

Author : Martin Summerfield
Publisher : Elsevier
ISBN 13 : 0323163351
Total Pages : 713 pages
Book Rating : 4.3/5 (231 download)

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Book Synopsis Solid Propellant Rocket Research by : Martin Summerfield

Download or read book Solid Propellant Rocket Research written by Martin Summerfield and published by Elsevier. This book was released on 2013-11-11 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Propellant Rocket Research

Smart Cards, Tokens, Security and Applications

Author : Keith Mayes
Publisher : Springer
ISBN 13 : 3319505009
Total Pages : 552 pages
Book Rating : 4.3/5 (195 download)

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Book Synopsis Smart Cards, Tokens, Security and Applications by : Keith Mayes

Download or read book Smart Cards, Tokens, Security and Applications written by Keith Mayes and published by Springer. This book was released on 2017-05-18 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a broad overview of the many card systems and solutions that are in practical use today. This new edition adds content on RFIDs, embedded security, attacks and countermeasures, security evaluation, javacards, banking or payment cards, identity cards and passports, mobile systems security, and security management. A step-by-step approach educates the reader in card types, production, operating systems, commercial applications, new technologies, security design, attacks, application development, deployment and lifecycle management. By the end of the book the reader should be able to play an educated role in a smart card related project, even to programming a card application. This book is designed as a textbook for graduate level students in computer science. It is also as an invaluable post-graduate level reference for professionals and researchers. This volume offers insight into benefits and pitfalls of diverse industry, government, financial and logistics aspects while providing a sufficient level of technical detail to support technologists, information security specialists, engineers and researchers.

Analyse de la Signature Radar Et de la Vidéoscopie de Cibles Militaires

Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Analyse de la Signature Radar Et de la Vidéoscopie de Cibles Militaires by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium

Download or read book Analyse de la Signature Radar Et de la Vidéoscopie de Cibles Militaires written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium and published by . This book was released on 1997 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Light Filaments

Author : Jean-Claude Diels
Publisher : IET
ISBN 13 : 1785612409
Total Pages : 391 pages
Book Rating : 4.7/5 (856 download)

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Book Synopsis Light Filaments by : Jean-Claude Diels

Download or read book Light Filaments written by Jean-Claude Diels and published by IET. This book was released on 2022 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume starts with tutorials about the science of filamentation before presenting in-depth chapters on the latest research, technologies and applications. It cover wide aspects of light filaments considering various mediums of propagation, with structured or single filaments, and filaments of different colours, as well as combined filaments. It also includes a wide range of applications from strong field ionisation and molecular properties to laser development and beam shaping, THz, lasing in air and supercontinuum generation.

Experimental Chaos

Author : Stefano Boccaletti
Publisher : A I P Press
ISBN 13 :
Total Pages : 384 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Experimental Chaos by : Stefano Boccaletti

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.

Organic Solid-State Lasers

Author : Sébastien Forget
Publisher : Springer
ISBN 13 : 3642367054
Total Pages : 179 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Organic Solid-State Lasers by : Sébastien Forget

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.

Low Frequency Scattering

Author : George Dassios
Publisher : Oxford University Press
ISBN 13 : 9780198536789
Total Pages : 322 pages
Book Rating : 4.5/5 (367 download)

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Book Synopsis Low Frequency Scattering by : George Dassios

Download or read book Low Frequency Scattering written by George Dassios and published by Oxford University Press. This book was released on 2000 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattering theory deals with the interactions of waves with obstacles in their path, and low frequency scattering occurs when the obstacles involved are very small. This book gives an overview of the subject for graduates and researchers, for the first time unifying the theories covering acoustic, electromagnetic and elastic waves.

Thermal Radiation Heat Transfer: The blackbody, electromagnetic theory, and material properties

Author : Robert Siegel
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Thermal Radiation Heat Transfer: The blackbody, electromagnetic theory, and material properties by : Robert Siegel

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:

"All it Is, It's a Carnival"

Author : Mária Németh Lenke
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis "All it Is, It's a Carnival" by : Mária Németh Lenke

Download or read book "All it Is, It's a Carnival" written by Mária Németh Lenke and published by . This book was released on 2007 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Diffusion in Materials - DIMAT 2011

Author : Igor Bezverkhyy
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038137030
Total Pages : 600 pages
Book Rating : 4.0/5 (381 download)

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Book Synopsis Diffusion in Materials - DIMAT 2011 by : Igor Bezverkhyy

Download or read book Diffusion in Materials - DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 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.