Carrier Dynamics In Mid Infrared Quantum Well Lasers Using Time Resolved Photoluminescence
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Carrier Dynamics In Mid Infrared Quantum Well Lasers Using Time Resolved Photoluminescence
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Author : Steven M. Gorski
language : en
Publisher:
Release Date : 2002-03-01
Carrier Dynamics In Mid Infrared Quantum Well Lasers Using Time Resolved Photoluminescence written by Steven M. Gorski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-03-01 with Hot carriers categories.
Research in mid-infrared laser technology has uncovered numerous applications for commercial and government use. A limiting factor for mid- infrared semiconductors is nonradiative recombination, which is a process that produces excess heat without emitting a photon. Nonradiative recombination mechanisms occur over a short time period and difficult to measure. Growth methods have significantly reduced the nonradiative recombination in some materials. The objective of this research is to further the understanding of how quantum well structures impact carrier recombination. InAsSb/InAlASb and InAs/ GaInSb quantum well structures were studied with time-resolved photoluminescence utilizing upconversion, a non-linear wave mixing technique. This research reports Shockley-Read-Hall, radiative, and Auger recombination coefficients at 77k. The luminescence rise times of type I and type II structures are also compared. The number of states available within the quantum well was found to dictate how quickly carriers were able to recombine radiatively. Finally, spectral data was taken to examine the spectral decay of the luminescence. Carrier temperatures were extracted from the spectral data. Type I structures were found to have hotter carrier temperatures and higher Auger coefficients than type II structures.
Time Resolved Photoluminescence Spectra Of A Mid Infrared Multiple Quantum Well Semiconductor Laser
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Author : Anthony L. Franz
language : en
Publisher:
Release Date : 1997-12-01
Time Resolved Photoluminescence Spectra Of A Mid Infrared Multiple Quantum Well Semiconductor Laser written by Anthony L. Franz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-12-01 with Photoluminescence categories.
Recombination mechanisms in mid-IR semiconductor lasers are strongly dependent on the carrier density of the active region. The objective of this research is to improve previous carrier density estimates through the incorporation of spectral information. One hundred photoluminescence (PL) spectra were calculated for a variety of carrier densities. Calculations were made for an InAsSb/InAlAsSb multiple quantum well laser sample assuming parabolic bands. The widths of the calculated spectral profiles were tabulated as a function of carrier density. Actual spectra were measured using the Ultrafast Mid-Infrared Photoluminescence System, which uses upconversion to measure the PL intensity in time steps smaller than 1 ps. PL spectra were obtained at 30 times, ranging from 100 ps to 3 ns. Spectral widths were measured and tabulated as a function of time. Combining the plot of calculated spectral width vs. carrier density with the plot of measured spectral width vs. time, we were able to describe the variation of carrier density with time. The carrier density vs. time plot thus generated agreed with earlier measurements by Cooley for low carrier densities. The discrepancy at higher carrier densities could be due to changing experimental conditions or the break down of the parabolic band approximation.
Measurement Of Ultrafast Carrier Recombination Dynamics In Mid Infrared Semiconductor Laser Material
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Author : William Cooley
language : en
Publisher:
Release Date : 1997-12-01
Measurement Of Ultrafast Carrier Recombination Dynamics In Mid Infrared Semiconductor Laser Material written by William Cooley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-12-01 with categories.
Shockley-Read-Hall, radiative, and Auger recombination rates in mid- infrared laser structures are measured and reported using time resolved photoluminescence (TRPL) frequency upconversion. The mid-IR lasers studied were actual InAsSb/InAlAsSb multiple-quantum-well (MQW) diode lasers emitting near 3. 3 micrometers which were previously characterized for laser performance. This effort extends the initial studies and reports on the carrier recombination dynamics. Shockley-Read-Hall, radiative and Auger recombination rates at low temperature (77 K) were measured and found to be A(sub SRH) approx.10 x 10(exp 7)/sec, B(sub rad) approx. 2 x 10(exp -10) cu cm/sec and C(sub Auger)
Building Blocks For Time Resolved Laser Emission In Mid Infrared Quantum Well Lasers
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Author : Gabriel D. Mounce
language : en
Publisher:
Release Date : 2003-03-01
Building Blocks For Time Resolved Laser Emission In Mid Infrared Quantum Well Lasers written by Gabriel D. Mounce and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-03-01 with categories.
The objective of this research is to improve the performance of mid- infrared semiconductor quantum-well lasers. Lasers operating in the mid-infrared are useful for many Air Force applications which include infrared (IR) countermeasures in particular. Countermeasure applications require lasers that are compact, and able to emit at high powers while operating at room temperature. Limits to power increases are seen in the transverse modal development of laser oscillation. These modes typically form in the waveguiding active region contributing to the laser output. However, competing modes outside of this region also develop when the confining structural layers have the right characteristics. These competing modes may draw power away from the main lasing mode, causing efficiency to drop. Therefore, theoretical models indicate that these "ghost" modes should be extinguished. The goal of this work is to incorporate antimony-based semiconductor laser devices into a time-resolved photoluminescence (TRPL) experiment to examine modal development immediately after excitation. TRPL utilizes a non-linear wave mixing technique known as frequency upconversion to resolve sub-picosecond luminescence occurrences after excitation. Modification to the experiment is performed to produce laser emission from five mid-IR semiconductor laser samples. Both spontaneous and stimulated emission spectra are recorded. Alignment of the experiment is also carried out to produce upconversion of the PL signal to prepare for the incorporation of laser emission.
Encyclopedia Of Spectroscopy And Spectrometry
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Author :
language : en
Publisher: Academic Press
Release Date : 2016-09-22
Encyclopedia Of Spectroscopy And Spectrometry written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-22 with Science categories.
This third edition of the Encyclopedia of Spectroscopy and Spectrometry, Three Volume Set provides authoritative and comprehensive coverage of all aspects of spectroscopy and closely related subjects that use the same fundamental principles, including mass spectrometry, imaging techniques and applications. It includes the history, theoretical background, details of instrumentation and technology, and current applications of the key areas of spectroscopy. The new edition will include over 80 new articles across the field. These will complement those from the previous edition, which have been brought up-to-date to reflect the latest trends in the field. Coverage in the third edition includes: Atomic spectroscopy Electronic spectroscopy Fundamentals in spectroscopy High-Energy spectroscopy Magnetic resonance Mass spectrometry Spatially-resolved spectroscopic analysis Vibrational, rotational and Raman spectroscopies The new edition is aimed at professional scientists seeking to familiarize themselves with particular topics quickly and easily. This major reference work continues to be clear and accessible and focus on the fundamental principles, techniques and applications of spectroscopy and spectrometry. Incorporates more than 150 color figures, 5,000 references, and 300 articles for a thorough examination of the field Highlights new research and promotes innovation in applied areas ranging from food science and forensics to biomedicine and health Presents a one-stop resource for quick access to answers and an in-depth examination of topics in the spectroscopy and spectrometry arenas
Summaries Of Papers Presented At The Conference On Lasers And Electro Optics
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Author :
language : en
Publisher:
Release Date : 2000
Summaries Of Papers Presented At The Conference On Lasers And Electro Optics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Electrooptics categories.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
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 2002 with Chemistry categories.
Long Wavelength Infrared Emitters Based On Quantum Wells And Superlattices
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Author : Manfred Helm
language : en
Publisher: CRC Press
Release Date : 2000-10-31
Long Wavelength Infrared Emitters Based On Quantum Wells And Superlattices written by Manfred Helm and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-10-31 with Technology & Engineering categories.
This book offers a thorough survey of long wavelength infrared semiconductor emitters based primarily on quantum wells and superlattices. Featuring contributions from the most prominent researchers in the field, this volume allows readers to compare different types of lasers as well as examine investigations of potential far-infrared/terrahertz sources. This is an essential reference for researchers, engineers and graduate students who wish to obtain comprehensive knowledge about infrared semiconductor sources and recent developments in this field.
Bismuth Containing Alloys And Nanostructures
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Author : Shumin Wang
language : en
Publisher: Springer
Release Date : 2019-07-03
Bismuth Containing Alloys And Nanostructures written by Shumin Wang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-03 with Technology & Engineering categories.
This book focuses on novel bismuth-containing alloys and nanostructures, covering a wide range of materials from semiconductors, topological insulators, silica optical fibers and to multiferroic materials. It provides a timely overview of bismuth alloys and nanostructures, from material synthesis and physical properties to device applications and also includes the latest research findings. Bismuth is considered to be a sustainable and environmentally friendly element, and has received increasing attention in a variety of innovative research areas in recent years. The book is intended as a reference resource and textbook for graduate students and researchers working in these fields.
Mid Infrared Semiconductor Optoelectronics
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Author : Anthony Krier
language : en
Publisher: Springer
Release Date : 2007-05-22
Mid Infrared Semiconductor Optoelectronics written by Anthony Krier and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-22 with Science categories.
Optoelectronic devices operating in the mid-infrared wavelength range offer applications in a variety of areas from environmental gas monitoring around oil rigs to the detection of narcotics. They could also be used for free-space optical communications, thermal imaging applications and the development of "homeland security" measures. Mid-infrared Semiconductor Optoelectronics is an overview of the current status and technological development in this rapidly emerging area; the basic physics, some of the problems facing the design engineer and a comparison of possible solutions are laid out; the different lasers used as sources for mid-infrared technology are considered; recent work in detectors is reviewed; the last part of the book is concerned with applications. With a world-wide authorship of experts working in many mid-infrared-related fields this book will be an invaluable reference for researchers and graduate students drawn from physics, electronic and electrical engineering and materials science.