Optimisation De Materiaux Dopes Par Les Ions Ytterbium Pour Applications Laser De Fortes Puissances

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Optimisation de matériaux dopés par les ions ytterbium pour applications laser de fortes puissances

Author : Pierre-Olivier Petit
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (758 download)

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Book Synopsis Optimisation de matériaux dopés par les ions ytterbium pour applications laser de fortes puissances by : Pierre-Olivier Petit

Download or read book Optimisation de matériaux dopés par les ions ytterbium pour applications laser de fortes puissances written by Pierre-Olivier Petit and published by . This book was released on 2010 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les lasers solides à base de monocristaux dopés par les ions ytterbium offrent un grand nombre d’avantages pour les applications laser de forte puissance ou en régime d’impulsions ultra-brèves. Les monocristaux d’aluminates, en particuliers Yb :CaGdAlO4 et Yb :YAlO3 sont des candidats très intéressants pour ces applications autour d’un micron. Nous avons cherché, dans le cadre de ce travail de thèse, à améliorer les qualités cristallines de ces matériaux en éliminant deux grandes familles de défauts présents : les centres colorés et les centres diffusants. Les monocristaux obtenus après traitement spécifique sont exempts de défauts et présentent des performances laser nettement supérieures. De plus, afin de tirer le meilleur partie des matériaux laser existants, une technique d’assemblage de matériaux par voie sol-gel a été développée. Des effets laser dans plusieurs matériaux hétéro-composites originaux ont été obtenus et des améliorations significatives de la thermique de ces systèmes ont été démontrés dans le cadre de ce travail

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.

Laser: 50 Years Of Discoveries

Author : Fabien Bretenaker
Publisher : World Scientific
ISBN 13 : 9814612421
Total Pages : 185 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Laser: 50 Years Of Discoveries by : Fabien Bretenaker

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.

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.

Handbook of Solid-State Lasers

Author : B Denker
Publisher : Elsevier
ISBN 13 : 0857097504
Total Pages : 688 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Handbook of Solid-State Lasers by : B Denker

Download or read book Handbook of Solid-State Lasers written by B Denker and published by Elsevier. This book was released on 2013-02-20 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-state lasers which offer multiple desirable qualities, including enhanced reliability, robustness, efficiency and wavelength diversity, are absolutely indispensable for many applications. The Handbook of solid-state lasers reviews the key materials, processes and applications of solid-state lasers across a wide range of fields.Part one begins by reviewing solid-state laser materials. Fluoride laser crystals, oxide laser ceramics, crystals and fluoride laser ceramics doped by rare earth and transition metal ions are discussed alongside neodymium, erbium and ytterbium laser glasses, and nonlinear crystals for solid-state lasers. Part two then goes on to explore solid-state laser systems and their applications, beginning with a discussion of the principles, powering and operation regimes for solid-state lasers. The use of neodymium-doped materials is considered, followed by system sizing issues with diode-pumped quasi-three level materials, erbium glass lasers, and microchip, fiber, Raman and cryogenic lasers. Laser mid-infrared systems, laser induced breakdown spectroscope and the clinical applications of surgical solid-state lasers are also explored. The use of solid-state lasers in defense programs is then reviewed, before the book concludes by presenting some environmental applications of solid-state lasers.With its distinguished editors and international team of expert contributors, the Handbook of solid-state lasers is an authoritative guide for all those involved in the design and application of this technology, including laser and materials scientists and engineers, medical and military professionals, environmental researchers, and academics working in this field. - Reviews the materials used in solid-state lasers - Explores the principles of solid-state laser systems and their applications - Considers defence and environmental applications

Special Welding Techniques

Author :
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Special Welding Techniques by :

Download or read book Special Welding Techniques written by and published by . This book was released on 1955 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Physical Properties of Amorphous Materials

Author : David Adler
Publisher : Springer Science & Business Media
ISBN 13 : 1489922601
Total Pages : 448 pages
Book Rating : 4.4/5 (899 download)

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Book Synopsis Physical Properties of Amorphous Materials by : David Adler

Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.

Advances in Spectroscopy for Lasers and Sensing

Author : Baldassare Di Bartolo
Publisher : Springer Science & Business Media
ISBN 13 : 1402047894
Total Pages : 574 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Advances in Spectroscopy for Lasers and Sensing by : Baldassare Di Bartolo

Download or read book Advances in Spectroscopy for Lasers and Sensing written by Baldassare Di Bartolo and published by Springer Science & Business Media. This book was released on 2006-07-21 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the Proceedings of "New Development in Optics and Related Fields," held in Italy in June, 2005. This meeting was organized by the International School of Atomic and Molecular Spectroscopy of the "Ettore Majorana" Center for Scientific Culture. The purpose of this Institute was to provide a comprehensive and coherent treatment of the new techniques and contemporary developments in optics and related fields.

Persistent Phosphors

Author : Jianrong Qiu
Publisher : Woodhead Publishing
ISBN 13 : 0128187727
Total Pages : 309 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Persistent Phosphors by : Jianrong Qiu

Download or read book Persistent Phosphors written by Jianrong Qiu and published by Woodhead Publishing. This book was released on 2020-11-24 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Persistent Phosphors: From Fundamentals to Applications provides an introduction to the key synthesis methods, characterization methods, physical mechanisms, and applications of this important luminescent materials system. The book covers basic persistent phosphorescence, introducing concepts such as emission, luminescence, phosphorescence, persistent phosphorescence and the development of persistent phosphors. Then, synthesis methods are reviewed and the connections between synthesis methods and improved materials properties are discussed. Characterization methods to investigate the trapping and de-trapping mechanism are also presented. Other sections cover the theoretical framework and energy band engineering models and materials with a focus on activators, hosts, emission bands and excitation bands. Finally, the most relevant applications of persistent phosphors are included for use in displays, safety signs, bio-labels and energy. Persistent Phosphors is an invaluable reference for materials scientists and engineers in academia and R&D. It is a key resource for chemists and physicists. - Presents characterization techniques to reveal the photophysical and photochemical properties of defects for this important category of luminescent materials - Discusses the structural role of defects in polycrystals and the capture-storing-migration-release progress of excited carriers - Demonstrates the synthesis routes and potential applications for persistent phosphor materials

Crystal Field Analysis

Author : Nicolae Avram
Publisher :
ISBN 13 : 9780080451480
Total Pages : pages
Book Rating : 4.4/5 (514 download)

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Book Synopsis Crystal Field Analysis by : Nicolae Avram

Download or read book Crystal Field Analysis written by Nicolae Avram and published by . This book was released on 2008-08 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook on Borates

Author : M. P. Chung
Publisher :
ISBN 13 : 9781607418221
Total Pages : 0 pages
Book Rating : 4.4/5 (182 download)

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Book Synopsis Handbook on Borates by : M. P. Chung

Download or read book Handbook on Borates written by M. P. Chung and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron is a naturally-occurring element. It is typically combined with other substances to form borates, including boric acid, salts of borates, and boron oxide. Boron is released naturally into the environment by oceans, volcanoes, and geothermal steam. It is also mined and used by many industries. Borates are used largely to produce glass. Boric acid is used in flame retardants, medicines, pesticides, and wood preservatives. Low-dose exposure can cause respiratory and skin irritation, vomiting, diarrhoea, nausea, and headaches. Borates have not been thoroughly tested for health effects in humans, but the EPA has found potential developmental toxicity (especially on the testes). Borates are considered safer to human health and the environment than other flame retardants (like PBDEs and PCBs) and wood preservatives (like arsenic). This new and important book gathers the latest research from around the globe in the study of borates with a focus on such topics as: boron-based wood preservatives and their uses, molecular aspects of boron treatment technologies, alkaline earth borates, borate toxicity and effect on drug stability and others.

Appropriate Technology for Developing Countries

Author : Willem Riedijk
Publisher :
ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Appropriate Technology for Developing Countries by : Willem Riedijk

Download or read book Appropriate Technology for Developing Countries written by Willem Riedijk and published by . This book was released on 1982 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serious, capable and experienced people, engineers, scientists and managers cooperatimg with base groups in the field of appropiate technology. Thousands of projects run by hundreds of organisations, institutesand groups, worldwide. That is the picture of AT today. So many people, so much work, so much hardware, but little recognition. Somany novelties, so few implementations. Is it the lack of funding and the lack of quality related with it? I don't think so. In third world countries A.T. is often seen as second best, even as a form of neocolonialism.

Specialty Optical Fibers Handbook

Author : Alexis Mendez
Publisher : Elsevier
ISBN 13 : 0080474993
Total Pages : 841 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Specialty Optical Fibers Handbook by : Alexis Mendez

Download or read book Specialty Optical Fibers Handbook written by Alexis Mendez and published by Elsevier. This book was released on 2011-10-10 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive contributed volume that aims to describe and explain the design, fabrication, operating characteristics, and specific applications of the most popular and useful types of specialty optical fibers. These "specialty fibers include any kind of optical fiber that has been architecturally manipulated to diverge from a conventional structure. For instance, metal-coated fibers can be utilized for bandwidth improvement, and hollow core fibers offer more controllable dispersion for sensitive medical procedures. Applications for these specialty fibers abound in the biomedical, sensors, and industrial fields, as well as in more traditional communications capacities. This book will act as a specialty fiber "guided tour, hosted by the top names in the discipline. The globally renowned editors, Drs. Mendez and Morse, have extensive experience in research, academia, and industry.*Completely covers biomedical and industrial sensor technology with emphasis on real world applications *Comparative studies of pros and cons of all fiber types with relation to test and measurement, mechanical properties and strength, and reliability*Easy to access essential facts and details at the begining of each chapter

Masters Theses in the Pure and Applied Sciences

Author : Wade H. Shafer
Publisher : Springer
ISBN 13 : 9780306341205
Total Pages : 320 pages
Book Rating : 4.3/5 (412 download)

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Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Développement de nouvelles sources laser à base de matériaux dopés par des ions ytterbium émettant vers 976 nm

Author : Aude Bouchier
Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.:/5 (493 download)

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Book Synopsis Développement de nouvelles sources laser à base de matériaux dopés par des ions ytterbium émettant vers 976 nm by : Aude Bouchier

Download or read book Développement de nouvelles sources laser à base de matériaux dopés par des ions ytterbium émettant vers 976 nm written by Aude Bouchier and published by . This book was released on 2005 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES SOURCES LASER EMETTANT AUTOUR DE 976 NM SONT NECESSAIRES DANS LES TELECOMMUNICATIONS OPTIQUES POUR LE POMPAGE DES AMPLIFICATEURS A FIBRE DOPEE PAR DES IONS ERBIUM, OU POUR REALISER UNE SOURCE A 488 NM APRES UNE CONVERSION NON LINEAIRE. LES SOURCES MONOMODES TRANSVERSES AVAIENT AU DEBUT DE MA THESE DES PUISSANCES LIMITEES A 1 W. DE PLUS FORTES PUISSANCES ETAIENT DEMANDEES. NOUS AVONS ETUDIE DES SOURCES BASEES SUR LES MATERIAUX DOPES PAR DES IONS YTTERBIUM, QUI PRESENTENT UNE IMPORTANTE SECTION EFFICACE D'EMISSION AUTOUR DE 976 NM. MAIS L'ABSORPTION A 976 NM EST TRES FORTE, LIEE AU CARACTERE TROIS NIVEAUX DE LA TRANSITION, NECESSITANT UN POMPAGE A 915 NM INTENSE POUR OBTENIR LA TRANSPARENCE A 976 NM. DEUX SOLUTIONS ONT ETE TESTEES.LES FIBRES MONOMODES DOPEES PAR DES IONS YTTERBIUM NOUS ONT PERMIS DE DEVELOPPER DIFFERENTES SOURCES, DONT UN LASER AFFINE SPECTRALEMENT TRES EFFICACE (72 %), QUI A SERVI A REALISER UNE SOURCE A 488 NM PAR DOUBLEMENT DE FREQUENCE DANS UN GUIDE D'ONDE NON LINEAIRE EN NIOBATE DE LITHIUM POLARISE PERIODIQUEMENT, AVEC UNE EFFICACITE DE CONVERSION DE 26 %. NOUS AVONS AUSSI ETUDIE L'AMPLIFICATION D'UNE DIODE LASER IMPULSIONNELLE A 976 NM DANS CES FIBRES, ET REALISE LE DOUBLEMENT DE LA FREQUENCE DE CETTE SOURCE AVEC UNE EFFICACITE DE 34 %. POUR DIMENSIONNER LES FIBRES UTILISEES, NOUS AVONS SIMULE LA PROPAGATION DES FAISCEAUX DANS CES FIBRES.NOUS AVONS ETUDIE EGALEMENT LE POTENTIEL DES CRISTAUX DE YB:KY(WO4)2. ILS ONT MONTRE UN FORT GAIN A 981 NM AVEC UN POMPAGE PAR UN LASER A SAPHIR DOPE AU TITANE A 931 NM. L'INTENSITE DES DIODES LASER A 931 NM ACTUELLES EST LIMITEE, INTERDISANT LE POMPAGE PAR DIODE DE CES CRISTAUX.

Matériaux lasers dopés à l'ion ytterbium

Author : Vanessa Cardinali
Publisher :
ISBN 13 :
Total Pages : 267 pages
Book Rating : 4.:/5 (117 download)

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Book Synopsis Matériaux lasers dopés à l'ion ytterbium by : Vanessa Cardinali

Download or read book Matériaux lasers dopés à l'ion ytterbium written by Vanessa Cardinali and published by . This book was released on 2011 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans les lasers, les gradients de température dans les milieux à gain provoquent des déformations de l'onde laser qui s'y propage. Le but de ma thèse est de mesurer les propriétés thermo-optiques (conductivité thermique, coefficient thermo-optique dn/dT, coefficient de dilatation) de nouveaux matériaux lasers permettant d'atteindre des énergies élevées à de hautes cadences de tir. Ces matériaux sont des céramiques sesquioxydes de scandium Sc2O3, de lutétium Lu2O3 et d'yttrium Y2O3 dopées ytterbium. Les mesures se font à basse température (température de l'azote liquide, 77 K) car les propriétés thermiques sont améliorées lorsque la température du matériau diminue. Ces matériaux ont également été testés en configuration d'oscillateur laser relaxé, montrant ainsi tout l'intérêt de travailler à basse température. Les mesures de ces propriétés représentent un enjeu majeur pour le développement des lasers de forte puissance, d'autant plus que les données de la littérature concernant ces matériaux, dans ces domaines de température, sont quasiment inexistantes. D'autres matériaux comme des cristaux et des céramiques de YAG, des cristaux de fluorure de calcium CaF2 dopés ytterbium, et des verres phosphates dopés néodyme ont également été testés.