Carrier energy relaxation time in quantum-well lasers

Carrier energy relaxation via carrier-polar optical phonon interactions with hot phonon effects in multisubband quantum-well structures is theoretically studied by using both bulk longitudinal optical phonons and confined longitudinal optical phonons. We find that the width and the depth of quantum...

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Veröffentlicht in:IEEE journal of quantum electronics 1995-12, Vol.31 (12), p.2148-2158
Hauptverfasser: Chin-Yi Tsai, Chin-Yao Tsai, Yu-Hwa Lo, Eastman, L.F.
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container_issue 12
container_start_page 2148
container_title IEEE journal of quantum electronics
container_volume 31
creator Chin-Yi Tsai
Chin-Yao Tsai
Yu-Hwa Lo
Eastman, L.F.
description Carrier energy relaxation via carrier-polar optical phonon interactions with hot phonon effects in multisubband quantum-well structures is theoretically studied by using both bulk longitudinal optical phonons and confined longitudinal optical phonons. We find that the width and the depth of quantum wells only have moderate effects on carrier energy relaxation rates. Our results also indicate that the difference of energy relaxation rates between the quantum well and the bulk material is not significant. We investigate the effects of longitudinal optical phonon lifetimes on the carrier energy relaxation rate. Neglect of the finite decay time of longitudinal optical phonons will significantly underestimate the carrier energy relaxation time; this not only contradicts the experimental results but also severely underestimates the nonlinear gain coefficient due to carrier heating. The implications of our theoretical results in designing high-speed quantum-well lasers are discussed.
doi_str_mv 10.1109/3.477740
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subjects Charge carriers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Heating
High speed optical techniques
Laser theory
Lasers
Nonlinear optics
Numerical methods
Optical scattering
Optics
Phonons
Physics
Quantum well lasers
Radiative recombination
Relaxation processes
Semiconductor device structures
Semiconductor lasers
laser diodes
Semiconductor quantum wells
Stimulated emission
Temperature
title Carrier energy relaxation time in quantum-well lasers
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