ETUDE DE LA DYNAMIQUE DES TRANSFERTS D'ENERGIE ET DES FLUORESCENCES DANS UN MATERIAU LASER SOLIDE EMETTANT DANS L'INFRA-ROUGE PDF Download

Author: Jacques Rubin
Publisher:
ISBN:
Category :
Languages : en
Pages : 180

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Book Description
L'OBJET DE CE TRAVAIL S'INSCRIT DANS LE CADRE DES LASERS A IONS TERRES RARES ET PLUS PARTICULIEREMENT DU LASER A HOLMIUM : HO**(3+) DANS LA MATRICE FLUOREE YLIF::(4). CELUI-CI PRESENTE LES INCONVENIENTS D'AVOIR DES SEUILS LASERS ELEVES ET DE MAUVAIS RENDEMENTS DE CONVERSION. A CES PROBLEMES, UN DEBUT DE SOLUTION EST APPARU AVEC LE SYSTEME : YLIF::(4) : ER**(3+); TM**(3+); HO**(3+) OU LES IONS ER**(3+) JOUENT LE ROLE DE SENSIBILISATEURS ABSORBANT LES EXCITATIONS LUMINEUSES ET A PARTIR DESQUELS L'ENERGIE EST TRANSFEREE VIA L'ION TM**(3+) VERS L'ION HO**(3+) D'OU NAIT L'EMISSION LASER. L'OBJECTIF ESSENTIEL EST LA DESCRIPTION DETAILLEE DES PROCESSUS DE DYNAMIQUE TEMPORELLE DES NIVEAUX D'ENERGIE DES IONS ER**(3+), TM**(3+) ET HO**(3+) A TEMPERATURE AMBIANTE

Author: BEATRICE.. MARTINAT
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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CE TRAVAIL CONCERNE LA MISE AU POINT DE NOUVEAUX MATERIAUX LASER SOLIDES PAR ACTIVATION, PAR DIFFERENTS IONS, DE LA MATRICE HEXAALUMINATE DE LANTHANE LAMGAL#1#1O#1#9 (LMA), TYPE MAGNETOPLOMBITE. DES MONOCRISTAUX DE LMA:TI ONT ETE ELABORES PAR PROCEDE VERNEUIL. LE TITANE Y EST PRESENT SIMULTANEMENT AUX ETATS D'OXYDATION 3+ ET 4+. LA MATRICE LMA PEUT ACCUEILLIR UNE PROPORTION IMPORTANTE DE TITANE (JUSQU'A UN ATOME DE TI#3#+ OU DE TI#4#+, REMPLACANT UN ATOME AL#3#+ PAR UNITE FORMULAIRE). LA RESONANCE PARAMAGNETIQUE ELECTRONIQUE A PERMIS, D'UNE PART DE DETERMINER LES SITES OCCUPES PAR TI, D'AUTRE PART DE CONNAITRE LA REPARTITION DE CELUI-CI EN FONCTION DU TAUX DE DOPAGE. UNE ETUDE APPROFONDIE DES PROPRIETES OPTIQUES (ABSORPTION ET FLUORESCENCE) DES CRISTAUX DE LMA:TI A ETE EFFECTUEE EN VUE DE L'APPLICATION EVENTUELLE DE CE MATERIAU COMME LASER ACCORDABLE. DANS LE BUT D'AMELIORER LE RENDEMENT LASER DU LNA (LMA:ND OU LA#1##XND#XMGAL#1#1O#1#9), MATERIAU LASER DE PUISSANCE, IL NOUS A ETE POSSIBLE DE SENSIBILISER LA FLUORESCENCE DU ND PAR DIFFERENTS IONS SENSIBILISATEURS (S) (S=TI#3#+, MN#2#+, EU#2#+, EU#3#+, TH#3#+ OU DY#3#+). L'ETUDE DES TRANSFERTS D'ENERGIE (S)ND A ETE REALISEE

Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179

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Book Description
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.

Author: Fabien Bretenaker
Publisher: World Scientific
ISBN: 9814612421
Category : Science
Languages : en
Pages : 185

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Book Description
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.

Author: Ann M. Martin
Publisher: Scholastic Inc.
ISBN: 1338057812
Category : Juvenile Fiction
Languages : en
Pages : 76

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From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! Yikes, My Bike! Karen is learning all about bike safety in school. She is even going to enter a bike-a-thon. But Karen’s bike is too small for her. So with Daddy’s help, Karen buys a new bike. Then Karen’s new bike is stolen. Can Karen catch the thief and get her bike back?

Author: F. Moriarty
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 324

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Book Description
Monitoring persistent organic pollhitants; exposure and residues; variationin the intake and elimination of pollutants; the role of the thy roid in the production of sublethal effec by organochlorine insecticides and polychlorine insecticides on amimal populations; persistent percides an economic and legal analysis.

Author: Godage B. Wickramanayake
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 532

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Book Description
- Thermal Desorption- In Situ Thermal Technologies- Plasma Technologies- In Situ Steam Processes- Soil Vapor Extraction/Multiphase Extraction- Enhancements to Pump-and-Treat-Systems- Groundwater Circulating Wells- Air Sparging- Dehalogenation Technologies- Oxidation Technologies- Photo-, Electro-, and Catalytic Mechanisms.