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Proceedings Paper

Effects of scatterings on the gain broadening of type-I quantum-cascade lasers
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Paper Abstract

The gain bandwidth of a quantum-cascade (QC) laser is important for determining the magnitude of the optical gain, the refractive index change, and the linewidth enhancement factor. We investigate the effects of the scattering mechanisms on the gain linewidth of a type-I QC laser and compare our theoretical results with experimental data. The bandwidth of the gain spectrum of a QC laser is related to the electron relaxation rate, which is determined by scatterings that change the electron momentum or energy in the same subband (intrasubband) or different subbands (intersubband). Polar optical phonon scattering, impurity scattering, and electron-electron scattering are the important mechanisms. In this paper, we investigate the magnitude of the linewidth of the optical gain spectrum due to these scattering mechanisms in type-I mid-IR QC laser structures. In particular, the dependence of the scattering rate on the doping position will be shown in the case of the impurity scattering. We also present calculated optical gain, refractive index change, and linewidth enhancement factor spectra. Our theoretical results agree well with the experimental data.

Paper Details

Date Published: 28 April 2005
PDF: 8 pages
Proc. SPIE 5722, Physics and Simulation of Optoelectronic Devices XIII, (28 April 2005); doi: 10.1117/12.589657
Show Author Affiliations
Jungho Kim, Univ. of Illinois at Urbana-Champaign (United States)
Shun Lien Chuang, Univ. of Illinois at Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5722:
Physics and Simulation of Optoelectronic Devices XIII
Marek Osinski; Fritz Henneberger; Hiroshi Amano, Editor(s)

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