ETUDE DE MATERIAUX DOPES NI**(2+) ET CO**(2+) POUR LASER ACCORDABLE A FONCTIONNEMENT CONTINU DANS LE PROCHE INFRAROUGE PDF Download
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Author: Jean-Marc Breteau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 323
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LES COMPOSES MGF::(2): NI, MGF::(2): CO, KZNF::(3): NI, KZNF::(3): CO ET MGA1::(2)O::(4): NI FONT L'OBJET D'UNE ETUDE SPECTROSCOPIQUE POUR DETERMINER LEURS CARACTERISTIQUES EN TANT QUE MATERIAUX POUR LASER ACCORDABLE A FONCTIONNEMENT CONTINU DANS LE PROCHE I.R. (1 MU M A 2 MU M). NOUS MONTRONS LE ROLE DE LA CONCENTRATION EN IONS ACTIFS SUR L'INTENSITE ET LA DUREE DE VIE DE FLUORESCENCE I.R. AINSI QUE L'IMPORTANCE DES TRANSFERTS D'ENERGIE ET DE LA REABSORPTION DANS L'ETAT EXCITE. POUR L'ENSEMBLE DES MATERIAUX, LES TRANSITIONS RADIATIVES ET NON RADIATIVES FONT L'OBJET D'UNE ETUDE APPROFONDIE QUI MET EN EVIDENCE DES DIFFERENCES DE COMPORTEMENT COMPAREES A DES ETUDES SIMILAIRES SUR LES TERRES RARES AINSI QUE LA RELATION EXISTANT ENTRE LE NIVEAU DE DOPAGE ET LA FORCE DU COUPLAGE ELECTRON-PHONON. UNE DESCRIPTION DETAILLEE DE L'ETUDE ET DE LA REALISATION DU LASER ACCORDABLE MGF::(2) : NI EST FAITE
Author: Jean-Marc Breteau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 323
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Book Description
LES COMPOSES MGF::(2): NI, MGF::(2): CO, KZNF::(3): NI, KZNF::(3): CO ET MGA1::(2)O::(4): NI FONT L'OBJET D'UNE ETUDE SPECTROSCOPIQUE POUR DETERMINER LEURS CARACTERISTIQUES EN TANT QUE MATERIAUX POUR LASER ACCORDABLE A FONCTIONNEMENT CONTINU DANS LE PROCHE I.R. (1 MU M A 2 MU M). NOUS MONTRONS LE ROLE DE LA CONCENTRATION EN IONS ACTIFS SUR L'INTENSITE ET LA DUREE DE VIE DE FLUORESCENCE I.R. AINSI QUE L'IMPORTANCE DES TRANSFERTS D'ENERGIE ET DE LA REABSORPTION DANS L'ETAT EXCITE. POUR L'ENSEMBLE DES MATERIAUX, LES TRANSITIONS RADIATIVES ET NON RADIATIVES FONT L'OBJET D'UNE ETUDE APPROFONDIE QUI MET EN EVIDENCE DES DIFFERENCES DE COMPORTEMENT COMPAREES A DES ETUDES SIMILAIRES SUR LES TERRES RARES AINSI QUE LA RELATION EXISTANT ENTRE LE NIVEAU DE DOPAGE ET LA FORCE DU COUPLAGE ELECTRON-PHONON. UNE DESCRIPTION DETAILLEE DE L'ETUDE ET DE LA REALISATION DU LASER ACCORDABLE MGF::(2) : NI EST FAITE
Author: Vincent Petit
Publisher:
ISBN:
Category :
Languages : fr
Pages : 274
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Book Description
Cette thèse porte sur l’étude de sources lasers à base d’ions Yb3+ pour une émission autour de 1 μm. Le premier objectif de ce travail était d’étudier des cristaux massifs dopés Yb3+ fabriqués au CIRIL pour réaliser des sources lasers en régime continu et en régime à impulsions brèves. Pour cela, nous avons concentré notre attention sur la matrice de CaF2 dopée Yb3+ qui combine les propriétés des cristaux (bonne conductivité thermique) et des verres (larges bandes d’émission). Bien que largement étudié par le passé, le CaF2 dopé par de l’ytterbium trivalent n’avait pas encore fait l’objet d’une étude spectroscopique détaillée. L’examen du fonctionnement laser a donc été précédé d’une étude spectroscopique pour de faibles et de forts taux de dopage en ions Yb3+. Les sites dits isolés ainsi que les agrégats d’ions terres rares ont pu être caractérisés clairement. Une étude laser expérimentale et théorique a ensuite été menée qui a conduit à d’excellentes performances, en régime continu ou femtoseconde, plaçant le CaF2:Yb3+ comme un des plus sérieux candidats pour ce type de source. Le second objectif de cette thèse était l’étude d’une source laser en optique intégrée émettant à 980 nm, utile dans le domaine des télécommunications (pompage des amplificateurs dopés erbium). Deux voies d’exploration ont été examinées, l’une sur des guides de SiO2:Yb,Ti,Ge fabriqués par pulvérisation magnétron réactive et l’autre sur des guides de CaF2:Yb3+ élaborés par implantation ionique. De premiers résultats expérimentaux ont été obtenus, et un modèle laser théorique nous a permis de prédire l’émission laser à 980 nm dans ce type de structure.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Measurement
Languages : en
Pages : 546
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Book Description
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Jean-Marie Basset
Publisher: Wiley-VCH
ISBN: 9783527319725
Category : Science
Languages : en
Pages : 725
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Book Description
Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Author: W. Petruk
Publisher: Elsevier
ISBN: 0080527337
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Author: Catherine Barnard
Publisher: Bloomsbury Publishing
ISBN: 184731869X
Category : Law
Languages : en
Pages : 337
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Book Description
The Cambridge Yearbook of European Legal Studies provides a forum for the scrutiny of significant issues in EU Law, the law of the European Convention on Human Rights, and Comparative Law with a 'European' dimension, and particularly those issues which have come to the fore during the year preceding publication. The contributions appearing in the collection are commissioned by the Centre for European Legal Studies (CELS) Cambridge, a research centre in the Law Faculty of the University of Cambridge specialising in European legal issues. The papers presented are at the cutting edge of the fields which they address, and reflect the views of recognised experts drawn from the University world, legal practice, and the institutions of both the EU and its Member States. Inclusion of the comparative dimension brings a fresh perspective to the study of European law, and highlights the effects of globalisation of the law more generally, and the resulting cross fertilisation of norms and ideas that has occurred among previously sovereign and separate legal orders. The Cambridge Yearbook of European Legal Studies is an invaluable resource for those wishing to keep pace with legal developments in the fast moving world of European integration. INDIVIDUAL CHAPTERS Please click on the link below to purchase individual chapters from Volume 13 through Ingenta Connect: www.ingentaconnect.com SUBSCRIPTION TO SERIES To place an annual online subscription or a print standing order through Hart Publishing please click on the link below. Please note that any customers who have a standing order for the printed volumes will now be entitled to free online access. www.hartjournals.co.uk/cyels/subs Editorial Advisory Board: Albertina Albors-Llorens, John Bell, Alan Dashwood, Simon Deakin, David Feldman, Richard Fentiman, Angus Johnston, John Spencer Founding Editors: Alan Dashwood and Angela Ward Ius Commune Prize 2012 Alexandre Saydé wrote Chapter 15 in this volume entitled: 'One Law, Two Competitions: An Enquiry into the Contradictions of Free Movement Law' and we are delighted to announce that he has been awarded the Ius Commune Prize 2012.
Author: John E Tedstrom
Publisher: Routledge
ISBN: 9780367303211
Category :
Languages : en
Pages : 239
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Book Description
This book highlights that Soviet economic planners and politicians must come to recognize the need to make fundamental changes, not simply incremental refinements, in the failing Soviet system. It examines the dynamics of the process of perestroika and the complexity of individual economic issues.
Author: Henry Allan Ironside
Publisher:
ISBN:
Category : Bible
Languages : en
Pages : 464
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Book Description
