Predictive quantum theory of current and optical gain in quantum cascade lasers

T. Kubis, P. Vogl

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We have developed a flexible and accurate self consistent non-equilibrium Green's functions method for stationary charge transport and optical gain in terahertz quantum cascade lasers. We compare our theoretical results with experimental data of a THz-QCL and find excellent quantitative agreement for the current- voltage characteristics and the peak gain energy. We identify non-radiative losses of electrons of the upper laser level to efficiently increase the threshold current and propose an optimized design that suppresses this coherent leakage.

Original languageEnglish
Pages (from-to)762-765
Number of pages4
JournalLaser Physics
Volume19
Issue number4
DOIs
StatePublished - Apr 2009
Externally publishedYes

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