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

Jungho Kim; Shun Lien Chuang

doi:10.1117/12.589657

28 April 2005 Effects of scatterings on the gain broadening of type-I quantum-cascade lasers

Jungho Kim, Shun Lien Chuang

Proceedings Volume 5722, Physics and Simulation of Optoelectronic Devices XIII; (2005) https://doi.org/10.1117/12.589657
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

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.

Citation Download Citation

Jungho Kim and Shun Lien Chuang "Effects of scatterings on the gain broadening of type-I quantum-cascade lasers", Proc. SPIE 5722, Physics and Simulation of Optoelectronic Devices XIII, (28 April 2005); https://doi.org/10.1117/12.589657

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