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Proceedings Paper

Self-consistent model of type-II quantum cascade lasers
Author(s): Guobin Liu; Shun-Lien Chuang
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Paper Abstract

The development of type-II Sb-based interband cascade lasers has attracted a considerable interest. For modeling of type-II quantum-well lasers in the mid-IR regime, the coupling of the conduction and valence bands, as well as the screened potential due to electron and hole distributions in separate layers, should be take into account. In this paper, a self-consistent model that solves simultaneously the effective-mass equation for the coupled conduction and valence bands and the Poisson's equation is applied to obtain the band structure. We reduce an eight-by-eight Hamiltonian based on the k*p method to two block-diagonalized four-by-four Hamiltonians under the axial approximation. The carrier accumulation in different layers and its screening effects are considered. The optical gain spectrum for type-II quantum-cascade lasers is then calculated. We compare our theoretical results based on the self-consistent model with those of the flat-band model (which ignores the carrier screening effects). Our model is applied to study temperature dependence of type-II quantum-well lasers. The self-consistent model is shown to be important to give a better agreement with experimental data. Our model is useful for designing high-power, high-efficiency, and high-temperature type-II interband cascade lasers.

Paper Details

Date Published: 12 June 2002
PDF: 10 pages
Proc. SPIE 4646, Physics and Simulation of Optoelectronic Devices X, (12 June 2002); doi: 10.1117/12.470570
Show Author Affiliations
Guobin Liu, Univ. of Illinois/Urbana-Champaign (United States)
Shun-Lien Chuang, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 4646:
Physics and Simulation of Optoelectronic Devices X
Peter Blood; Marek Osinski; Yasuhiko Arakawa, Editor(s)

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