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Author: BEATRICE.. DE BEAUVOIR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 220
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L'OBJET DE CETTE THESE EST LA CONSTRUCTION D'UN LASER ETALON A 778 NM POUR REALISER UNE MESURE ABSOLUE DES FREQUENCES 2S-8S/D DES ATOMES D'HYDROGENE ET DE DEUTERIUM. CET ETALON DE FREQUENCE EST UNE DIODE LASER STABILISEE EN FREQUENCE SUR UNE TRANSITION A DEUX PHOTONS 5S-5D DE L'ATOME DE RUBIDIUM. LES PERFORMANCES METROLOGIQUES DE CE LASER ETALON SONT 10 FOIS MEILLEURES QUE CELLES DU LASER HE-NE STABILISE SUR L'IODE. LA FREQUENCE DE CE LASER A ETE MESUREE AU COURS DE CETTE THESE GRACE A UNE CHAINE DE MULTIPLICATION DE FREQUENCE SITUEE A L'OBSERVATOIRE DE PARIS. L'ETUDE DES CARACTERISTIQUES METROLOGIQUES DE LA FIBRE OPTIQUE RELIANT NOS LABORATOIRES A MONTRE QUE LE PASSAGE DU FAISCEAU DU LASER ETALON DANS CELLE-CI NE DETERIORAIT PAS SES PROPRIETES METROLOGIQUES. LES TRANSITIONS 2S-8S/D SONT EXCITEES DANS UN JET ATOMIQUE PAR UN LASER TITANE-SAPHIR. PLUSIEURS EFFETS PARASITES DEPLACENT ET ELARGISSENT LES RAIES ETUDIEES. POUR S'AFFRANCHIR DE CES EFFETS, UNE FORME DE RAIE THEORIQUE EST AJUSTEE SUR LES SIGNAUX EXPERIMENTAUX. ELLE TIENT COMPTE EN PARTICULIER DE L'EFFET STARK LINEAIRE SUR LES NIVEAUX EXCITES. LA COMPARAISON EN FREQUENCE DU LASER D'EXCITATION ET DU LASER ETALON DONNE LA FREQUENCE ABSOLUE DE LA RAIE ETUDIEE. ON EN DEDUIT LA VALEUR DE LA CONSTANTE DE RYDBERG: R = 109737,3156849 (10)CM#-#1 CE RESULTAT, QUI EST LE PLUS PRECIS A CE JOUR, EST EN BON ACCORD AVEC CELUI OBTENU A MUNICH EN 1995 SUR LES TRANSITIONS 1S-2S ET 2S-4D. EN COMPARANT LES MESURES DU DEUTERIUM A CELLE DE L'HYDROGENE, ON DETERMINE LA VALEUR DU DEPLACEMENT DE LAMB DE L'ETAT 2S DU DEUTERIUM: L#2#S#-#2#P = 1059,228 (9)MHZ CETTE MESURE AMELIORE L'INCERTITUDE SUR CETTE VALEUR DE DEUX ORDRES DE GRANDEUR ; ELLE EST EN BON ACCORD AVEC LA DERNIERE MESURE DE CETTE QUANTITE. L'INCERTITUDE SUR CES RESULTATS APPROCHE CELLE DES CALCULS D'ELECTRODYNAMIQUE QUANTIQUE DONNANT LES VALEURS THEORIQUES DES NIVEAUX D'ENERGIE
Author: BEATRICE.. DE BEAUVOIR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 220
Get Book Here
Book Description
L'OBJET DE CETTE THESE EST LA CONSTRUCTION D'UN LASER ETALON A 778 NM POUR REALISER UNE MESURE ABSOLUE DES FREQUENCES 2S-8S/D DES ATOMES D'HYDROGENE ET DE DEUTERIUM. CET ETALON DE FREQUENCE EST UNE DIODE LASER STABILISEE EN FREQUENCE SUR UNE TRANSITION A DEUX PHOTONS 5S-5D DE L'ATOME DE RUBIDIUM. LES PERFORMANCES METROLOGIQUES DE CE LASER ETALON SONT 10 FOIS MEILLEURES QUE CELLES DU LASER HE-NE STABILISE SUR L'IODE. LA FREQUENCE DE CE LASER A ETE MESUREE AU COURS DE CETTE THESE GRACE A UNE CHAINE DE MULTIPLICATION DE FREQUENCE SITUEE A L'OBSERVATOIRE DE PARIS. L'ETUDE DES CARACTERISTIQUES METROLOGIQUES DE LA FIBRE OPTIQUE RELIANT NOS LABORATOIRES A MONTRE QUE LE PASSAGE DU FAISCEAU DU LASER ETALON DANS CELLE-CI NE DETERIORAIT PAS SES PROPRIETES METROLOGIQUES. LES TRANSITIONS 2S-8S/D SONT EXCITEES DANS UN JET ATOMIQUE PAR UN LASER TITANE-SAPHIR. PLUSIEURS EFFETS PARASITES DEPLACENT ET ELARGISSENT LES RAIES ETUDIEES. POUR S'AFFRANCHIR DE CES EFFETS, UNE FORME DE RAIE THEORIQUE EST AJUSTEE SUR LES SIGNAUX EXPERIMENTAUX. ELLE TIENT COMPTE EN PARTICULIER DE L'EFFET STARK LINEAIRE SUR LES NIVEAUX EXCITES. LA COMPARAISON EN FREQUENCE DU LASER D'EXCITATION ET DU LASER ETALON DONNE LA FREQUENCE ABSOLUE DE LA RAIE ETUDIEE. ON EN DEDUIT LA VALEUR DE LA CONSTANTE DE RYDBERG: R = 109737,3156849 (10)CM#-#1 CE RESULTAT, QUI EST LE PLUS PRECIS A CE JOUR, EST EN BON ACCORD AVEC CELUI OBTENU A MUNICH EN 1995 SUR LES TRANSITIONS 1S-2S ET 2S-4D. EN COMPARANT LES MESURES DU DEUTERIUM A CELLE DE L'HYDROGENE, ON DETERMINE LA VALEUR DU DEPLACEMENT DE LAMB DE L'ETAT 2S DU DEUTERIUM: L#2#S#-#2#P = 1059,228 (9)MHZ CETTE MESURE AMELIORE L'INCERTITUDE SUR CETTE VALEUR DE DEUX ORDRES DE GRANDEUR ; ELLE EST EN BON ACCORD AVEC LA DERNIERE MESURE DE CETTE QUANTITE. L'INCERTITUDE SUR CES RESULTATS APPROCHE CELLE DES CALCULS D'ELECTRODYNAMIQUE QUANTIQUE DONNANT LES VALEURS THEORIQUES DES NIVEAUX D'ENERGIE
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 772
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Author: Jan Gyllenbok
Publisher: Birkhäuser
ISBN: 3319575988
Category : Science
Languages : en
Pages : 691
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Book Description
This first of three volumes starts with a short introduction to historical metrology as a scientific discipline and goes on with an anthology of acient and modern measurement systems of all kind, scientific measures, units of time, weights, currencies etc. It concludes with an exhaustive list of references. Units of measurement are of vital importance in every civilization through history. Since the early ages, man has through necessity devised various measures to assist him in everyday life. They have enabled and continue to enable us to trade in commonly and equitably understood amounts, and to investigate, understand, and control the chemical, physical, and biological processes of the natural world. The essence of the work is an alphabetically ordered, comprehensive list of measurement nomenclature, units and scales. It provides an understanding of almost all quantitative expressions observed in all imaginable situations, including spelling variants and the abbreviations and symbols for units, and various acronyms used in metrology. It will be of use not only to historians of science and technology, but also to economic and social historians and should be in every major academic and national library as standard reference work on the topic.
Author: Deryle Lonsdale
Publisher: Routledge
ISBN: 1135973504
Category : Foreign Language Study
Languages : en
Pages : 974
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A Frequency Dictionary of French is an invaluable tool for all learners of French, providing a list of the 5000 most frequently used words in the language. Based on a 23-million-word corpus of French which includes written and spoken material both from France and overseas, this dictionary provides the user with detailed information for each of the 5000 entries, including English equivalents, a sample sentence, its English translation, usage statistics, and an indication of register variation. Users can access the top 5000 words either through the main frequency listing or through an alphabetical index. Throughout the frequency listing there are thematically-organized lists of the top words from a variety of key topics such as sports, weather, clothing, and family terms. An engaging and highly useful resource, the Frequency Dictionary of French will enable students of all levels to get the most out of their study of French vocabulary. Former CD content is now available to access at www.routledge.com/9780415775311 as support material. Designed for use by corpus and computational linguists it provides the full text in a format that researchers can process and turn into suitable lists for their own research work. Deryle Lonsdale is Associate Professor in the Linguistics and English Language Department at Brigham Young University (Provo, Utah). Yvon Le Bras is Associate Professor of French and Department Chair of the French and Italian Department at Brigham Young University (Provo, Utah).
Author: J. Belle
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 146
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Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
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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: Alain Hébert
Publisher: Presses inter Polytechnique
ISBN: 2553014368
Category : Nuclear physics
Languages : en
Pages : 426
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Author:
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 172
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Author: James J. Duderstadt
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 630
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Problems after each chapter
