Measurement Of Ultrafast Carrier Recombination Dynamics In Mid Infrared Semiconductor Laser Material
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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)
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.
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.
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.
Optical Techniques For Solid State Materials Characterization
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Author : Rohit P. Prasankumar
language : en
Publisher: CRC Press
Release Date : 2016-04-19
Optical Techniques For Solid State Materials Characterization written by Rohit P. Prasankumar and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-19 with Science categories.
Over the last century, numerous optical techniques have been developed to characterize materials, giving insight into their optical, electronic, magnetic, and structural properties and elucidating such diverse phenomena as high-temperature superconductivity and protein folding. Optical Techniques for Solid-State Materials Characterization provides
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1997
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Dissertation abstracts categories.
Materials Science In Photocatalysis
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Author : Elisa I. Garcia Lopez
language : en
Publisher: Elsevier
Release Date : 2021-08-15
Materials Science In Photocatalysis written by Elisa I. Garcia Lopez and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-08-15 with Technology & Engineering categories.
Materials Science in Photocatalysis provides a complete overview of the different semiconductor materials, from titania to third-generation photocatalysts, examining the increasing complexity and novelty of the materials science in photocatalytic materials. The book describes the most recommended synthesis procedure for each of them and the suitable characterization techniques for determining the optical, structural, morphological, and physical-chemical properties. The most suitable applications of the photocatalysts are described in detail, as well as their environmental applications for wastewater treatment, gaseous effluents depollution, water splitting, CO2 ?xation, selective organic synthesis, coupling reactions, and other selective transformations under both UV light and visible-light irradiation. This book offers a useful reference for a wide audience from students studying chemical engineering and materials chemistry to experienced researchers working on chemical engineering, materials science, materials engineering, environment engineering, nanotechnology, and green chemistry. Includes a complete overview of the different semiconductor materials used as photocatalysts Describes methods of preparation and characterization of photocatalysts and their applications Examines new possibilities to prepare effective photocatalysts
Ultrashort Pulse Lasers And Ultrafast Phenomena
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Author : Takayoshi Kobayashi
language : en
Publisher: CRC Press
Release Date : 2023-03-21
Ultrashort Pulse Lasers And Ultrafast Phenomena written by Takayoshi Kobayashi and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-03-21 with Science categories.
Introduces the basics of nonlinear optics which provides the generation and measurement of ultrashort pulse lasers Explains basic physical principle of ultrashort pulse laser construction Describes detailed structure of the world shortest visible laser and DUV lasers Introduces the scheme of ultrafast spectroscopy using the ultrashort pulse lasers Provides several examples of the applications of ultrafast spectroscopy to solid state materials
Advance Elements Of Laser Circuits And Systems
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Author : Ofer Aluf
language : en
Publisher: Springer Nature
Release Date : 2021-03-09
Advance Elements Of Laser Circuits And Systems written by Ofer Aluf and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-09 with Technology & Engineering categories.
This book on Advance Elements of Laser circuits and systems Nonlinearity applications in engineering addresses two separate engineering and scientific areas, and presents advanced analysis methods for Laser circuits and systems that cover a broad range of engineering and scientific applications. The book analyzed Laser circuits and systems as linear and nonlinear dynamical systems and there limit cycles, bifurcation, and limit cycle stability by using nonlinear dynamic theory. Further, it discussed a broad range of bifurcations related to Laser systems and circuits, starting from laser system differential equations and their bifurcations, delay differential equations (DDEs) are a function of time delays, delay dependent parameters, followed by phase plane analysis, limit cycles and their bifurcations, chaos, iterated maps, period doubling. It combines graphical information with analytical analysis to effectively study the local stability of Laser systems models involving delay dependent parameters. Specifically, the stability of a given steady state is determined by the graphs of some functions of which can be expressed explicitly. The Laser circuits and systems are Laser diode circuits, MRI system Laser diode circuitry, Electron-photon exchanges into VCSEL, Ti: Sapphire laser systems, Ion channel and long-wavelength lasers, Solid state lasers, Solid state laser controlled by semiconductor devices, microchip solid-state laser, Q-switched diode-pumped solid-state laser, Nd:YAG, Mid-Infrared and Q-switched microchip lasers, Gas laser systems, copper vapor laser (CVL) circuitry, Dual-wavelength laser systems, Dual-wavelength operation of a Ti:sapphire laser, Diode-pumped Q-switched Nd:YVO4 yellow laser, Asymmetric dual quantum well lasers, Tm3+-doped silica fibre lasers, Terahertz dual-wavelength quantum cascade laser. The Book address also the additional areas, Laser X guiding system, Plasma diagnostics, Laser Beam shaping, Jitter and crosstalk, Plasma mirror systems, and High power Laser/Target diagnostic system optical elements. The book is unique in its emphasis on practical and innovative engineering and scientific applications. All conceptual Laser circuits are innovative and can be broadly implemented in many engineering applications. The dynamics of Laser circuits and systems provides several ways to use them in a variety of applications covering wide areas. This book is aimed at electrical and electronics engineers, students and researchers in physics as well. It is also aimed for research institutes in lasers and plasma physics and gives good comprehensive in laser and plasma systems. In each chapter, the concept is developed from basic assumptions up to the final engineering and scientific outcomes. The scientific background is explained at basic and advance levels and closely integrated with mathematical theory. Many examples are presented in this book and it is also ideal for intermediate level courses at graduate level studies. It is also ideal for engineer who has not had formal instruction in nonlinear dynamics, but who now desires to fill the gap between innovative Laser circuits/systems and advance mathematical analysis methods
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.