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Author: CHRISTINE.. LATRASSE
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
CETTE THESE PORTE SUR LA STABILISATION DE FREQUENCE DE DIODES LASER SUR DES TRANSITIONS MOLECULAIRES AUTOUR DE 1,5 MICRON. LES DEUX PREMIERS CHAPITRES PORTENT D'UNE PART SUR LES REFERENCES MOLECULAIRES DISPONIBLES ET D'AUTRE PART, SUR LES METHODES LES PLUS COURAMMENT UTILISEES POUR UNE STABILISATION DE FREQUENCE. LES SPECTRES EXPERIMENTAUX DE L'AMMONIAC ET DE L'ACETYLENE SONT PRESENTES. LE CHAPITRE III DECRIT LA STABILISATION D'UN LASER A CAVITE ETENDUE SUR UNE RAIE D'ABSORPTION DE L'AMMONIAC SANS MODULATION DE FREQUENCE. LA SOURCE REALISEE PRESENTE UNE LARGEUR DE RAIE DE 60 KHZ ET UNE STABILITE DE FREQUENCE DE QUELQUES 10##1#0 SUR 10 S. LE DERNIER CHAPITRE CONCERNE LA STABILISATION DE LASERS DFB SUR UNE TRANSITION D'ACETYLENE 13, PAR UNE METHODE DE SPECTROSCOPIE FM. UNE MODULATION DIRECTE DU COURANT A 350 MHZ PERMET D'ASSERVIR LA FREQUENCE AU SOMMET DE LA RAIE D'ABSORPTION. DES MODULES DE 0,5 LITRE ONT ETE REALISES ET ONT PRESENTE UNE STABILITE DE FREQUENCE DE L'ORDRE DE 10##9 JUSQU'A 1000S
Author: CHRISTINE.. LATRASSE
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
CETTE THESE PORTE SUR LA STABILISATION DE FREQUENCE DE DIODES LASER SUR DES TRANSITIONS MOLECULAIRES AUTOUR DE 1,5 MICRON. LES DEUX PREMIERS CHAPITRES PORTENT D'UNE PART SUR LES REFERENCES MOLECULAIRES DISPONIBLES ET D'AUTRE PART, SUR LES METHODES LES PLUS COURAMMENT UTILISEES POUR UNE STABILISATION DE FREQUENCE. LES SPECTRES EXPERIMENTAUX DE L'AMMONIAC ET DE L'ACETYLENE SONT PRESENTES. LE CHAPITRE III DECRIT LA STABILISATION D'UN LASER A CAVITE ETENDUE SUR UNE RAIE D'ABSORPTION DE L'AMMONIAC SANS MODULATION DE FREQUENCE. LA SOURCE REALISEE PRESENTE UNE LARGEUR DE RAIE DE 60 KHZ ET UNE STABILITE DE FREQUENCE DE QUELQUES 10##1#0 SUR 10 S. LE DERNIER CHAPITRE CONCERNE LA STABILISATION DE LASERS DFB SUR UNE TRANSITION D'ACETYLENE 13, PAR UNE METHODE DE SPECTROSCOPIE FM. UNE MODULATION DIRECTE DU COURANT A 350 MHZ PERMET D'ASSERVIR LA FREQUENCE AU SOMMET DE LA RAIE D'ABSORPTION. DES MODULES DE 0,5 LITRE ONT ETE REALISES ET ONT PRESENTE UNE STABILITE DE FREQUENCE DE L'ORDRE DE 10##9 JUSQU'A 1000S
Author: Kédro Diomandé
Publisher:
ISBN:
Category :
Languages : fr
Pages : 153
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Book Description
AMELIORATION DE LA PURETE SPECTRALE D'UN LASER A SEMICONDUCTEUR EMETTANT A 1,5 MU PAR ADJONCTION D'UNE CAVITE PASSIVE A LA CAVITE DE LA DIODE. LARGEUR DE RAIE INFERIEURE A 20 KHZ. LASER ACCORDABLE SUR PLUSIEURS DIZAINES DE NANOMETRES. - THEORIE DU LASER A CAVITE ETENDUE. METHODES DE MESURE DE LA LARGEUR DE RAIE DES LASERS A SEMICONDUCTEUR. APPLICATION DU LASER A CAVITE ETENDUE A L'ANALYSE SPECTRALE D'UN LASER A CONTRE REACTION DISTRIBUEE. UTILISATION DU LASER A CAVITE ETENDUE POUR FAIRE UN RELEVE DU SPECTRE D'ABSORPTION DE L'AMMONIAC GAZEUX AUTOUR DE 1,5 MU . DETERMINATION DE LA STABILITE EN FREQUENCE A LONG TERME DU LASER A CAVITE ETENDUE ASSERVI SUR UNE RAIE D'ABSORPTION DE L'AMMONIAC.
Author: Philippe Laurent
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
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Book Description
We report our work on diode laser frequency stabilization emitting near 850 and 1300 nanometers.In first, we demonstrate a single-mode operation from an initially multimode diode laser with an optical feedback on an external mirror.Secondly, a confocal Fabry-Perot cavity is used to feedback the beam from the diode laser and provide resonant optical stabilization of the semiconductor laser. We present a detailed theoretical analysis of the static and dynamic frequency noise power spectrum of the coupled cavity laser field. Experimentally we achieve static frequency noise reduction of 50-60 dB and obtain a dramatic reduction of the laser line with from 20 MHz to a few kHz.The frequency tenability of these coupled cavity diode lasers are achieved by a double servo-loop system and we have obtained a continuously frequency tuning of 7 GHz without laser spectral purity degradation.Applications of these techniques include optical pumping Cesium docks and frequency synthesis in the visible.
Author: Jean-Marc Lapauw
Publisher:
ISBN:
Category :
Languages : fr
Pages : 196
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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: John Wiley & Sons
ISBN: 3527627103
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: 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.
