Temperature dependent nonlinear response of quantum cascade structures

Research output: Contribution to journalArticle

Abstract

Current response and gain spectrum of a terahertz quantum cascade laser is analyzed at different temperatures by a nonequilibrium Green's functions approach. The simulations are compared to recent results of time domain spectroscopy. Being able to retrieve higher harmonics of the response function, nonlinear phenomena in quantum cascade lasers are studied theoretically. For different temperatures, gain is simulated under operating conditions and related to the intensity inside the cavity, showing the degradation of performance with temperature. Resolving the electron densities in energy shows the breakdown of inversion at high intensities.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics

Keywords

  • Terahertz, Quantum cascade lasers, Gain simulations, Nonlinear response, Gain clamping
Original languageEnglish
Pages (from-to)533-539
JournalOptical and Quantum Electronics
Volume46
Issue number4
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes

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