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Conception De Diodes Laser A Puits Quantique Grin Sch Gaalas Gaas
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Book Synopsis Conception de diodes laser à puits quantique GRIN-SCH GaAlAs/GaAs by : Stéphane Fourtine
Download or read book Conception de diodes laser à puits quantique GRIN-SCH GaAlAs/GaAs written by Stéphane Fourtine and published by . This book was released on 1990 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE TRAVAIL RAPPORTE DANS CE MEMOIRE A CONSISTE A DEVELOPPER ET A VALIDER UN LOGICIEL DE CONCEPTION DE DIODES LASER A PUITS QUANTIQUE DE TYPE GRIN-SCH EN GAALAS/GAAS. LE LOGICIEL QWT PERMET D'OBTENIR POUR UNE STRUCTURE QUELCONQUE LA CARACTERISTIQUE GAIN-COURANT, DE DETERMINER LA DENSITE DE COURANT DE SEUIL, LA LONGUEUR D'ONDE D'EMISSION LASER ET D'ANALYSER L'ENSEMBLE DE CES GRANDEURS EN FONCTION DE LA TEMPERATURE. DANS LE MODELE, LA PHYSIQUE DU PUITS QUANTIQUE EST TRAITEE DE FACON APPROFONDIE AINSI QUE LES MECANISMES D'EMISSION ET DE RECOMBINAISON DANS LE PUITS ET DANS LES COUCHES DE CONFINEMENT. L'ACCENT A ETE MIS EN PARTICULIER SUR L'IDENTIFICATION ET L'EVALUATION DES SOURCES DE PERTES QUI PARTICIPENT A L'AUGMENTATION DE LA DENSITE DE COURANT DE SEUIL. UNE ETUDE SYSTEMATIQUE DE L'EVOLUTION DES COURANTS DE FUITE EN FONCTION DES DIFFERENTS PARAMETRES DE LA STRUCTURE A PERMIS D'ETABLIR DES CRITERES D'OPTIMISATION DE LA DENSITE DE COURANT DE SEUIL ET DU COEFFICIENT DE STABILITE EN FONCTION DE LA PLAGE DE FONCTIONNEMENT EN TEMPERATURE SOUHAITE ET DU GAIN AU SEUIL CHOISI. ENFIN, UNE ETUDE EXPERIMENTALE PORTANT SUR TROIS SERIES DE DIODES LASER ELABOREES AU LAAS AYANT DES COMPOSITIONS EN ALUMINIUM DANS LE PUITS DE 0%, 15% ET 20% A PERMIS DE VALIDER LE MODELE DEVELOPPE. L'EXPLOITATION SIMULTANEE DES RESULTATS EXPERIMENTAUX ET THEORIQUES NOUS A DONNE UNE ESTIMATION DES PERTES INTERNES DE NOS STRUCTURES ET AINSI UNE APPRECIATION DE LA QUALITE DE NOTRE TECHNOLOGIE. LA COMPARAISON THEORIE-EXPERIENCE DES VARIATIONS EN TEMPERATURE DE LA DENSITE DE COURANT DE SEUIL, DE LA LONGUEUR D'ONDE D'EMISSION ET DU PARAMETRE DE STABILITE T#0 ONT MONTRE LA VALIDITE DES MODELES THEORIQUES DEVELOPPES
Book Synopsis Conception de diodes laser à puits quantique GRIN-SCH GaAIAs-GaAs by : Stéphane Fourtine
Download or read book Conception de diodes laser à puits quantique GRIN-SCH GaAIAs-GaAs written by Stéphane Fourtine and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimization of Broad-area GaAs Diode Lasers for High Powers and High Efficiencies in the Temperature Range 200-220 K by : Frevert Carlo
Download or read book Optimization of Broad-area GaAs Diode Lasers for High Powers and High Efficiencies in the Temperature Range 200-220 K written by Frevert Carlo and published by . This book was released on 2019-07-11 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on the development of AlGaAs-based diode laser (DL) bars optimized for reaching highest powers and efficiencies at low operation temperatures. Specifically, the quasi continuous wave (QCW) pumping of cryogenically cooled Yb: YAG solid-state lasers is targeted, setting requirements on the wavelength (940 nm), the pulse conditions (pulse length 1.2 ms) and frequency (10 Hz) as well as the lowest DL operating temperature THS 200 K, consistent with economic cooling. High fill-factor bars for QCW operation are to reach high optical performance with optical output powers of P 1.5 kW and power conversion efficiencies of ŋE 60% at these power levels. Understanding the efficiency-limiting factors and the behavior at lower temperatures is necessary to design these devices. Optimizations are performed iteratively in three stages. First, vertical epitaxial designs are studied theoretically, adjusted to the targeted operation temperatures and specific laser parameters are extracted. Secondly, resulting vertical designs are processed into low power single emitters and their electro-optical behavior at low currents is experimentally assessed over a wide range of temperatures. The obtained laser parameters characteristic to the vertical design are then used to extrapolate the laser's performance up to the high targeted currents. Finally, vertical designs promising to reach the targeted values for power and efficiency are processed into high power single emitters and bars which are measured up to the highest currents. Eventually, laser bars are fabricated reaching output powers of 2 kW and efficiencies of 61% at 1.5 kW at an operation temperature of 203 K.
Book Synopsis The Blue Laser Diode by : Shuji Nakamura
Download or read book The Blue Laser Diode written by Shuji Nakamura and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1993, the author, Shuji Nakamura developed the first commercially available blue and green light-emitting diodes. Now he has made the most important breakthrough in solid state laser techniques to date - the first blue semiconductor laser based on GaN. Here, Dr. Nakamura discusses the physical concept and basic manufacturing technology of these new blue light-emitting and laser diodes. he shows how this represents a new era in commercial applications for semiconductors, including displays, road and railway signalling, lighting, scanners, optical data storage, and much more. Moreover, Nakamura provides fascinating background information on the extraordinary realisation of an extremely successful concept of research and development. Of interest to researchers as well as engineers.
Book Synopsis Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers by : Thorben Kaul
Download or read book Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers written by Thorben Kaul and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
