Design Simulation And Analysis Of Laterally Longitudinally Non Uniform Edge Emitting Gaas Based Diode Lasers Band 73
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Design Simulation And Analysis Of Laterally Longitudinally Non Uniform Edge Emitting Gaas Based Diode Lasers Band 73
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Author : Jan-Philipp Koester
language : en
Publisher: Cuvillier Verlag
Release Date : 2023-09-19
Design Simulation And Analysis Of Laterally Longitudinally Non Uniform Edge Emitting Gaas Based Diode Lasers Band 73 written by Jan-Philipp Koester and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-19 with categories.
Edge-emitting quantum-well diode lasers based on GaAs combine a high conversion efficiency, a wide range of emission wavelengths covering a span from 630 nm to 1180 nm, and the ability to achieve high output powers. The often used longitudinal-invariant Fabry-Pérot-type resonators are easy to design but often lead to functionality or performance limitations. In this work, the application of laterally-longitudinally non-uniform resonator configurations is explored as a way to reduce unwanted and performance-limiting effects. The investigations are carried out on existing and entirely newly developed laser designs using dedicated simulation tools. These include a sophisticated time-dependent laser simulator based on a traveling-wave model of the optical fields in the lateral-longitudinal plane and a Maxwell solver based on the eigenmode expansion method for the simulation of passive waveguides. Whenever possible, the simulation results are compared with experimental data. Based on this approach, three fundamentally different laser types are investigated: • Dual-wavelength lasers emitting two slightly detuned wavelengths around 784 nm out of a single aperture • Ridge-waveguide lasers with tapered waveguide and contact layouts that emit light of a wavelength of around 970 nm • Broad-area lasers with slightly tapered contact layouts emitting at 910 nm The results of this thesis underline the potential of lateral-longitudinal non-uniform laser designs to increase selected aspects of device performance, including beam quality, spectral stability, and output power.
Design Simulation And Analysis Of Laterally Longitudinally Non Uniform Edge Emitting Gaas Based Diode Lasers
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Author : Jan-Philipp Koester
language : en
Publisher:
Release Date : 2023
Design Simulation And Analysis Of Laterally Longitudinally Non Uniform Edge Emitting Gaas Based Diode Lasers written by Jan-Philipp Koester and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Short Channel Gan Fet Mmic Technology For High Reliability Applications Band 74
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Author : Konstantin Osipov
language : en
Publisher: Cuvillier Verlag
Release Date : 2024-02-07
Short Channel Gan Fet Mmic Technology For High Reliability Applications Band 74 written by Konstantin Osipov and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-07 with categories.
Nowdays GaN HEMT technology reached maturity level that allows industral fabrication of such devices for wide range of civil (telecommunications, power electrinics, automotive etc.), as well as space and military (phased array radars) applications. At this level, technology start reaching physical limits of GaN material and require new approaches that will allow to overcome some of well known problems related to GaN HEMTs, such as high gate leakage currents, reliability issues and difficulties of normally-off transistor fabrication. The goal of these theses is theoretical and experimental confirmation of the idea, that using peizoelectric nature of GaN crystal will allow local modification of GaN HEMT channel by means of external mechanical stress (using first and second passivation layers as stressors). After implementation of the proposed technology changes and new device geometry in process flow intended for 150 nm GaN HEMTMMIC fabrication, E/D devices with pinch-off voltages +0.1V and -1.65V respectively were fabricated on the same wafer within single process flow. It was observed, that E-mode devices, fabricated using compressed passivation layers, demonstrate lower gate leakage currents and more robust in HTRB test as compared to D-mode devices. In summary, it was demonstrated, that it is possible to control pinch-off voltage and gate leakage current of short channel GaN HEMTs by application of external stress. Usage of external stress, opens new degree of freedom in device optimization, and extends opportunities for more advanced MMIC design.
Untersuchung Der Degradation Von Inalgan Basierten Ultravioletten Leuchtdioden Zur Verbesserung Der Zuverl Ssigkeit Band 79
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Author : Johannes Glaab
language : de
Publisher: Cuvillier Verlag
Release Date : 2025-06-20
Untersuchung Der Degradation Von Inalgan Basierten Ultravioletten Leuchtdioden Zur Verbesserung Der Zuverl Ssigkeit Band 79 written by Johannes Glaab and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-06-20 with categories.
Diese Arbeit untersucht das betriebsinduzierte Degradationsverhalten von InAlGaN-basierten UV-C und UV-B LEDs. Durch Analyse des zeitlichen Verlaufs von elektroopti-schen Parametern, wie beispielsweise optische Leistung und Betriebsspannung, sowie Materialanalytischen Messungen konnten drei Degradationsmechanismen identifiziert werden, welche zu einer Reduktion der optischen Leistung der LEDs führen: Die Aktivie-rung von Magnesium-Wasserstoff-Komplexen, die Bildung von Punktdefekten in der akti-ven Zone, sowie die Diffusion von Punktdefekten in die aktive Zone. Optimierungen der Heterostruktur, des p-Dotierprofil und der Elektronenblockierschicht verbesserten die Lochinjektion und strahlende Rekombination, wodurch die initiale Leistung erhöht und die Lebensdauer der LEDs deutlich gesteigert werden konnte.
Ceramic Lasers
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Author : Akio Ikesue
language : en
Publisher: Cambridge University Press
Release Date : 2013-05-23
Ceramic Lasers written by Akio Ikesue and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-23 with Science categories.
Until recently, ceramic materials were considered unsuitable for optics due to the numerous scattering sources, such as grain boundaries and residual pores. However, in the 1990s the technology to generate a coherent beam from ceramic materials was developed, and a highly efficient laser oscillation was realized. In the future, the technology derived from the development of the ceramic laser could be used to develop new functional passive and active optics. Co-authored by one of the pioneers of this field, the book describes the fabrication technology and theoretical characterization of ceramic material properties. It describes novel types of solid lasers and other optics using ceramic materials to demonstrate the application of ceramic gain media in the generation of coherent beams and light amplification. This is an invaluable guide for physicists, materials scientists and engineers working on laser ceramics.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1994
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Physics categories.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 1991
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Chemical abstracts categories.
Electrical Electronics Abstracts
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Author :
language : en
Publisher:
Release Date : 1994
Electrical Electronics Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Electrical engineering categories.
Handbook Of Distributed Feedback Laser Diodes Second Edition
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Author : Geert Morthier
language : en
Publisher: Artech House
Release Date : 2013-09-01
Handbook Of Distributed Feedback Laser Diodes Second Edition written by Geert Morthier and has been published by Artech House this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-01 with Technology & Engineering categories.
Since the first edition of this book was published in 1997, the photonics landscape has evolved considerably and so has the role of distributed feedback (DFB) laser diodes. Although tunable laser diodes continue to be introduced in advanced optical communication systems, DFB laser diodes are still widely applied in many deployed systems. This also includes wavelength tunable DFB laser diodes and DFB laser diode arrays, usually integrated with intensity or phase modulators and semiconductor optical amplifiers. This valuable resource gives professionals a comprehensive description of the different effects that determine the behavior of a DFB laser diode. Special attention is given to two new chapters on wavelength tunable DFB laser diodes and bistable and unstable DFB laser diodes. Among many other updates throughout the reference, semi-conductor and electromagnetic professionals are also provided two new appendices. This book fully covers the underlying theory, commercial applications, necessary design criteria, and future direction of this technology.
Semiconductor Optoelectronic Devices
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Author : Joachim Piprek
language : en
Publisher: Elsevier
Release Date : 2013-10-22
Semiconductor Optoelectronic Devices written by Joachim Piprek and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Technology & Engineering categories.
Optoelectronics has become an important part of our lives. Wherever light is used to transmit information, tiny semiconductor devices are needed to transfer electrical current into optical signals and vice versa. Examples include light emitting diodes in radios and other appliances, photodetectors in elevator doors and digital cameras, and laser diodes that transmit phone calls through glass fibers. Such optoelectronic devices take advantage of sophisticated interactions between electrons and light. Nanometer scale semiconductor structures are often at the heart of modern optoelectronic devices. Their shrinking size and increasing complexity make computer simulation an important tool to design better devices that meet ever rising perfomance requirements. The current need to apply advanced design software in optoelectronics follows the trend observed in the 1980's with simulation software for silicon devices. Today, software for technology computer-aided design (TCAD) and electronic design automation (EDA) represents a fundamental part of the silicon industry. In optoelectronics, advanced commercial device software has emerged recently and it is expected to play an increasingly important role in the near future. This book will enable students, device engineers, and researchers to more effectively use advanced design software in optoelectronics. - Provides fundamental knowledge in semiconductor physics and in electromagnetics, while helping to understand and use advanced device simulation software - Demonstrates the combination of measurements and simulations in order to obtain realistic results and provides data on all required material parameters - Gives deep insight into the physics of state-of-the-art devices and helps to design and analyze of modern optoelectronic devices