Download or read book Contribution a l etude des proprietes dynamiques des lasers semiconducteurs 1 5 um a multipuits quantiques written by Augustin Olivier and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude des propri t s dynamiques des lasers semiconducteurs 1 5 um multipuits quantiques written by Augustin Olivier and published by . This book was released on 1990 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce mémoire présente l'évaluation du gain différentiel et du coefficient de saturation du gain avec la densité de photons des lasers scmqw émettant à 1,5 m. Pour cela nous avons mis au point des méthodes de caractérisation originales pour analyser les propriétés dynamiques des lasers, pour lesquelles nous avons réalisé des photodiodes pin de fréquence de coupure à 3 db supérieure à 18 ghz. En considérant un gain linéaire pour les scmqw, nous avons établi une relation linéaire entre le rapport fréquence de résonance au carré et de la puissance émise, proportionnelle au gain différentiel et l'inverse de la longueur de la cavité. Cette relation nous a permis de constater expérimentalement que le gain différentiel était 3 à 4 fois plus élevé dans les lasers scmqw que dans les lasers conventionnels. L'analyse de la génération d'harmoniques dans la cavité a permis d'établir à la fréquence de résonance une relation linéaire entre le coefficient de saturation du gain avec la densité de photons et le taux de modulation correspondant au point d'intersection des harmoniques. Une méthode de mesure fondée sur cette propriété a permis de déduire le coefficient de saturation du gain trois fois plus élevé dans les structures scmqw. Ceci conduit à une fréquence de résonance ultime identique pour les structures scmqw et conventionnelle. Nous avons validé par une analyse de la modulation de fréquence, après avoir déterminé le coefficient de variation de l'indice de réfraction avec les porteurs, les valeurs précédemment évaluées et déterminé une réduction du facteur de Henry des lasers scmqw
Download or read book CONTRIBUTION A L ETUDE DE LASERS A SEMI CONDUCTEURS MULTISECTIONS EMETTANT A 1 5 MICRON ACCORDABLES EN LONGUEUR D ONDE written by JOEL.. JACQUET and published by . This book was released on 1992 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES PROGRES TECHNOLOGIQUES SPECTACULAIRES, POUR LA REALISATION DE LASERS A SEMI-CONDUCTEURS EMETTANT A 1.5 M, ONT DONNE LIEU A UNE EVOLUTION CONSIDERABLE DES SYSTEMES DE TRANSMISSION OPTIQUE. LA HAUTE PURETE SPECTRALE DES SOURCES, L'ACCOUDABILITE EN LONGUEUR D'ONDE ET LA MODULATION DE FREQUENCE PAR LE COURANT D'INJECTION DES LASERS SONT A LA BASE DE SYSTEMES DE TRANSMISSION EN MODULATION FSK UTILISANT LE MULTIPLEXAGE FREQUENTIEL ET, A LA RECEPTION, LA DETECTION HETERODYNE (DITE COHERENTE). NOUS PRESENTONS DANS CE MEMOIRE L'ETUDE DE LASERS MULTISECTIONS REPONDANT A CES CRITERES. UN MODELE SIMPLE, BASE SUR LA THEORIE DES MODES COUPLES, EST UTILISE POUR CALCULER LES CARACTERISTIQUES ESSENTIELLES DES LASERS (COURANT DE SEUIL, RENDEMENT, LARGEUR DE RAIE, SELECTIVITE MODALE, ACCORDABILITE). CE MODELE, VALIDE POUR DES LASERS DFB, A PERMIS DE CONCEVOIR DES STRUCTURES DBR A 3 ELECTRODES. LES DBR REALISES ONT MONTRE UNE ACCORDABILITE SUPERIEURE A 4 NM ET UNE LARGEUR DE RAIE INFERIEURE A 10 MHZ SUR UNE PLAGE DE LONGUEUR D'ONDE DE 3 MM. AVEC DE TELLES PERFORMANCES, CE COMPOSANT PEUT-ETRE UTILISE COMME OSCILLATEUR LOCAL DANS UNE ARCHITECTURE RESEAU COMPORTANT PLUS DE 60 CANAUX, SEPARES DE 6 GHZ, EN MODULATION FSK A 600 MBIT/S. POUR UN TEL SYSTEME, LA SOURCE EMETTRICE DOIT PRESENTER UNE REPONSE EN MODULATION DE FREQUENCE AVEC UNE GRANDE BANDE PASSANTE ET UNE SENSIBILITE FM ELEVEE ET PLATE AVEC LA FREQUENCE. UNE MODELISATION DE STRUCTURES A PLUSIEURS SECTIONS ACTIVES, BASEE SUR LA RESOLUTION DES EQUATIONS DE CONTINUITE ET TENANT COMPTE DE LA DISTRIBUTION DE PHOTON, MONTRE QUE CES PERFORMANCES PEUVENT ETRE ATTEINTES MOYENNANT UNE OPTIMISATION DES LONGUEURS ET DES COURANTS D'INJECTION DE CHAQUE SECTION. ON A AINSI REALISE DES LASERS DBR A 4 ELECTRODES ET DES DFB A ZONE DE PHASE MODULABLE PRESENTANT UNE SENSIBILITE FM ELEVEE ET PLATE JUSQU'A 1 GHZ. UN RESEAU DE DISTRIBUTION DE 8 CANAUX EN MODULATION FSK A 600 MBIT/S ET DETECTION COHERENTE A ETE REALISE AVEC CES COMPOSANTS.
Download or read book DYNAMIC PROPERTIES OF SEMI CONDUCTOR INJECTION LASERS written by Denis Leclerc and published by . This book was released on 1986 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE PRESENTE UNE ETUDE THEORIQUE ET EXPERIMENTALE DES PROPRIETES DYNAMIQUES, EN REGIME DE MODULATION DIRECTE D'INTENSITE, DES LASERS A SEMICONDUCTEURS 1,3 ET 1,5 MICRONS DESTINES A DES LIAISONS PAR FIBRES OPTIQUES MONOMODES LONGUE DISTANCE-HAUT DEBIT. LE DISPOSITIF EXPERIMENTAL PERMET DE DISPOSER D'IMPULSIONS DE COURANT DE TEMPS DE TRANSITION VOISIN DE 100 PS ET INCLU UN SYSTEME DE DETECTION OPTIQUE DE BANDE PASSANTE SUPERIEURE A 5 GHZ. PARTANT DE L'ANALYSE DES LASERS A RUBAN ENTERRE BH, NOUS AVONS ETABLI UN MODELE SIMPLE, APPLICABLE A TOUT TYPE DE LASER RUBAN, RENDANT COMPTE DE L'INFLUENCE SUR LA FREQUENCE MAXIMALE DE MODULATION DES ELEMENTS RESISTIFS ET CAPACITIFS DISTRIBUES DANS LA STRUCTURE DU COMPOSANT. NOUS AVONS AINSI ETUDIE LES STRUCTURES BH, RIDGE, RIDGE ENTERRE, DCPBH, ET IL A ETE POSSIBLE EN PARTICULIER DE REALISER DES LASERS DE STRUCTURES AMELIOREES QUE NOUS AVONS MODULES JUSQU'A 2 GBIT/S. LES OSCILLATIONS DE RELAXATION SE PRODUISANT DANS LA REPONSE OPTIQUE A UN CRENEAU DE COURANT ONT ETE ETUDIEES EN RELATION AVEC LES DIFFERENTS PARAMETRES DECRIVANT LE LASER. LES RESULTATS EXPERIMENTAUX SONT SYSTEMATIQUEMENT COMPARES AUX PREDICTIONS THEORIQUES D'UN MODELE INCLUANT L'EMISSION SPONTANEE ET LA DIFFUSION DES PORTEURS. LE PHENOMENE SPECTRAL DE FLUCTUATION DE LA LONGUEUR D'ONDE D'EMISSION, ETUDIE A L'AIDE DE LASER DFB, A PU ETRE CLAIREMENT ASSOCIE AUX OSCILLATIONS DE RELAXATION. UN DEPHASAGE D'UN QUART DE PERIODE ENTRE LES EVOLUTIONS DE LA LONGUEUR D'ONDE ET DE LA DENSITE DE PHOTONS A ETE MIS EN EVIDENCE
Download or read book CONTRIBUTION A L ETUDE DE LASERS A SEMI CONDUCTEURS MULTISECTIONS EMETTANT A 1 5 MICRON ACCORDABLES EN LONGUEUR D ONDE written by Joël Jacquet (enseignant-chercheur à Supelec).) and published by . This book was released on 1992 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES PROGRES TECHNOLOGIQUES SPECTACULAIRES, POUR LA REALISATION DE LASERS A SEMI-CONDUCTEURS EMETTANT A 1.5 M, ONT DONNE LIEU A UNE EVOLUTION CONSIDERABLE DES SYSTEMES DE TRANSMISSION OPTIQUE. LA HAUTE PURETE SPECTRALE DES SOURCES, L'ACCOUDABILITE EN LONGUEUR D'ONDE ET LA MODULATION DE FREQUENCE PAR LE COURANT D'INJECTION DES LASERS SONT A LA BASE DE SYSTEMES DE TRANSMISSION EN MODULATION FSK UTILISANT LE MULTIPLEXAGE FREQUENTIEL ET, A LA RECEPTION, LA DETECTION HETERODYNE (DITE COHERENTE). NOUS PRESENTONS DANS CE MEMOIRE L'ETUDE DE LASERS MULTISECTIONS REPONDANT A CES CRITERES. UN MODELE SIMPLE, BASE SUR LA THEORIE DES MODES COUPLES, EST UTILISE POUR CALCULER LES CARACTERISTIQUES ESSENTIELLES DES LASERS (COURANT DE SEUIL, RENDEMENT, LARGEUR DE RAIE, SELECTIVITE MODALE, ACCORDABILITE). CE MODELE, VALIDE POUR DES LASERS DFB, A PERMIS DE CONCEVOIR DES STRUCTURES DBR A 3 ELECTRODES. LES DBR REALISES ONT MONTRE UNE ACCORDABILITE SUPERIEURE A 4 NM ET UNE LARGEUR DE RAIE INFERIEURE A 10 MHZ SUR UNE PLAGE DE LONGUEUR D'ONDE DE 3 MM. AVEC DE TELLES PERFORMANCES, CE COMPOSANT PEUT-ETRE UTILISE COMME OSCILLATEUR LOCAL DANS UNE ARCHITECTURE RESEAU COMPORTANT PLUS DE 60 CANAUX, SEPARES DE 6 GHZ, EN MODULATION FSK A 600 MBIT/S. POUR UN TEL SYSTEME, LA SOURCE EMETTRICE DOIT PRESENTER UNE REPONSE EN MODULATION DE FREQUENCE AVEC UNE GRANDE BANDE PASSANTE ET UNE SENSIBILITE FM ELEVEE ET PLATE AVEC LA FREQUENCE. UNE MODELISATION DE STRUCTURES A PLUSIEURS SECTIONS ACTIVES, BASEE SUR LA RESOLUTION DES EQUATIONS DE CONTINUITE ET TENANT COMPTE DE LA DISTRIBUTION DE PHOTON, MONTRE QUE CES PERFORMANCES PEUVENT ETRE ATTEINTES MOYENNANT UNE OPTIMISATION DES LONGUEURS ET DES COURANTS D'INJECTION DE CHAQUE SECTION. ON A AINSI REALISE DES LASERS DBR A 4 ELECTRODES ET DES DFB A ZONE DE PHASE MODULABLE PRESENTANT UNE SENSIBILITE FM ELEVEE ET PLATE JUSQU'A 1 GHZ. UN RESEAU DE DISTRIBUTION DE 8 CANAUX EN MODULATION FSK A 600 MBIT/S ET DETECTION COHERENTE A ETE REALISE AVEC CES COMPOSANTS.
Download or read book Contribution l tude des propri t s spectrales et spatiales des lasers semi conducteurs en cavit externe microforme written by Sylvain Mailhot and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1996 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microcavities written by Alexey Kavokin and published by OUP Oxford. This book was released on 2011-04-27 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid development of microfabrication and assembly of nanostructures has opened up many opportunities to miniaturize structures that confine light, producing unusual and extremely interesting optical properties. This book addresses the large variety of optical phenomena taking place in confined solid state structures: microcavities. Realisations include planar and pillar microcavities, whispering gallery modes, and photonic crystals. The microcavities represent a unique laboratory for quantum optics and photonics. They exhibit a number of beautiful effects including lasing, superfluidity, superradiance, entanglement etc. Written by four practitioners strongly involved in experiments and theories of microcavities, it is addressed to any interested reader having a general physical background, but in particular to undergraduate and graduate students at physics faculties.
Download or read book III Nitride Semiconductors written by M.O. Manasreh and published by Elsevier. This book was released on 2000-12-06 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research advances in III-nitride semiconductor materials and device have led to an exponential increase in activity directed towards electronic and optoelectronic applications. There is also great scientific interest in this class of materials because they appear to form the first semiconductor system in which extended defects do not severely affect the optical properties of devices. The volume consists of chapters written by a number of leading researchers in nitride materials and device technology with the emphasis on the dopants incorporations, impurities identifications, defects engineering, defects characterization, ion implantation, irradiation-induced defects, residual stress, structural defects and phonon confinement. This unique volume provides a comprehensive review and introduction of defects and structural properties of GaN and related compounds for newcomers to the field and stimulus to further advances for experienced researchers. Given the current level of interest and research activity directed towards nitride materials and devices, the publication of the volume is particularly timely. Early pioneering work by Pankove and co-workers in the 1970s yielded a metal-insulator-semiconductor GaN light-emitting diode (LED), but the difficulty of producing p-type GaN precluded much further effort. The current level of activity in nitride semiconductors was inspired largely by the results of Akasaki and co-workers and of Nakamura and co-workers in the late 1980s and early 1990s in the development of p-type doping in GaN and the demonstration of nitride-based LEDs at visible wavelengths. These advances were followed by the successful fabrication and commercialization of nitride blue laser diodes by Nakamura et al at Nichia. The chapters contained in this volume constitutes a mere sampling of the broad range of research on nitride semiconductor materials and defect issues currently being pursued in academic, government, and industrial laboratories worldwide.
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Download or read book Excitons in Confined Systems written by Rodolfo Del Sole and published by Springer. This book was released on 1988 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book UV Solid State Light Emitters and Detectors written by Michael S. Shur and published by Springer Science & Business Media. This book was released on 2004-05-31 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared and visible light LEDs and photodetectors have found numerous applications and have become a truly enabling technology. The promise of solid state lighting has invigorated interest in white light LEDs. Ultraviolet LEDs and solar blind photodetectors represent the next frontier in solid state emitters and hold promise for many important applications in biology, medi cine, dentistry, solid state lighting, displays, dense data storage, and semi conductor manufacturing. One of the most important applications is in sys tems for the identification of hazardous biological agents. Compared to UV lamps, UV LEDs have lower power consumption, a longer life, compactness, and sharper spectral lines. UV LEDs can provide a variety of UV spectra and have shape and form factor flexibility and rugged ness. Using conventional phosphors, UV LEDs can generate white light with high CRI and high efficiency. If quantum cutter phosphors are developed, white light generation by UV LEDs might become even more efficient. Advances in semiconductor materials and in improved light extraction techniques led to the development of a new generation of efficient and pow erful visible high-brightness LEDs and we expect that similar improvements will be achieved in solid-state UV technology.
Download or read book Physics of Semiconductors written by Wolfgang Jantsch and published by American Institute of Physics. This book was released on 2007-04-30 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features peer-reviewed papers that were presented at the 28th International Conference on the Physics of Semiconductors. This biannual conference presents and discusses all important developments and outstanding recent results in the field of semiconductor physics: one of the most important disciplines in solid state physics. Semiconductor physics provides the scientific basis for the microelectronic device industry.
Download or read book III V Nitride Semiconductors written by Edward T. Yu and published by CRC Press. This book was released on 2022-10-30 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concepts in this book will provide a comprehensive overview of the current state for a broad range of nitride semiconductor devices, as well as a detailed introduction to selected materials and processing issues of general relevance for these applications. This compilation is very timely given the level of interest and the current stage of research in nitride semiconductor materials and device applications. This volume consists of chapters written by a number of leading researchers in nitride materials and device technology addressing Ohmic and Schottky contacts, AIGalnN multiple quantum well laser diodes, nitride vertical cavity emitting lasers, and ultraviolet photodetectors. This unique volume provides a comprehensive review and introduction to application and devices based on GaN and related compounds for newcomers to the field and stimulus to further advances for experienced researchers.
Download or read book Semiconductor Quantum Dots written by Y. Masumoto and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor quantum dots represent one of the fields of solid state physics that have experienced the greatest progress in the last decade. Recent years have witnessed the discovery of many striking new aspects of the optical response and electronic transport phenomena. This book surveys this progress in the physics, optical spectroscopy and application-oriented research of semiconductor quantum dots. It focuses especially on excitons, multi-excitons, their dynamical relaxation behaviour and their interactions with the surroundings of a semiconductor quantum dot. Recent developments in fabrication techniques are reviewed and potential applications discussed. This book will serve not only as an introductory textbook for graduate students but also as a concise guide for active researchers.
Download or read book Blue Laser and Light Emitting Diodes written by Akihiko Yoshikawa and published by IOS Press. This book was released on 1996 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Realization of the semiconductor laser diodes (LDs) operating in the blue wavelength region had been a 'dream' for a long time for the scientists working on widegap materials until just a few years ago. Quite remarkable progress has been made in the last few years the dream has come true. The first ZnSe-based blue/green LD was fabricated about four years ago and its officially reported life-time in CW operation exceeds 100 hours now; it is quickly approaching a practical use level. Further, GaN-based blue LDs have also been realized. In this way, the progress in these research fields is quite rapid. The work includes articles on bulk growth, epitaxy, doping and characterization, blue LDs and LEDs, and future prospects in both ZnSe-based and GaN-based areas.
Download or read book Exciton Polaritons in Microcavities written by Daniele Sanvitto and published by Springer Science & Business Media. This book was released on 2012-05-01 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, there has been a burst of new and fascinating physics associated to the unique properties of two-dimensional exciton polaritons, their recent demonstration of condensation under non-equilibrium conditions and all the related quantum phenomena, which have stimulated extensive research work. This monograph summarizes the current state of the art of research on exciton polaritons in microcavities: their interactions, fast dynamics, spin-dependent phenomena, temporal and spatial coherence, condensation under non-equilibrium conditions, related collective quantum phenomena and most advanced applications. The monograph is written by the most active authors who have strongly contributed to the advances in this area. It is of great interests to both physicists approaching this subject for the first time, as well as a wide audience of experts in other disciplines who want to be updated on this fast moving field.
