4.6 Article

Intersubband linewidths in quantum cascade laser designs

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APPLIED PHYSICS LETTERS
卷 93, 期 14, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.2993212

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  1. Swiss Commission for Technology and Innovation
  2. Swiss National Science Foundation

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We present a model to a priori calculate the temperature and field dependent intersubband linewidth of the optical transition in quantum cascade laser designs. Besides intra- and intersubband lifetime broadening, it comprises interface roughness scattering based on the approach of Tsujino et al. [Appl. Phys. Lett. 86, 062113 (2005)]. We verified our model with experimental data of quantum cascade lasers having different linewidths. Excellent agreement with the experiment was found for the two-phonon resonance design. Linewidths are slightly overestimated in the bound-to-continuum design. Differential gain and threshold current density are in excellent agreement for the two-phonon resonance design. Although the slope efficiency is somewhat underestimated at low temperatures, there is still reasonable agreement with the experiment. (C) 2008 American Institute of Physics.

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