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Optical Engineering

Nonlinear gain behavior in injectorless quantum cascade lasers
Author(s): Simeon Katz; Augustinas Vizbaras; Gerhard Boehm; Markus-Christian Amann
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Paper Abstract

The gain spectra of a continuous wave operating injectorless quantum cascade lasers are presented. These are extracted by the Hakki-Paoli method from electroluminescence measurements. The device operates around 7.4 µm and has threshold current densities in pulsed and continuous wave operation at room temperature that measure 1.1 and 1.76 kA/cm2, respectively. The differential gain coefficients around 100 cm/kA at liquid nitrogen temperature and 44 cm/kA around room temperature are determined. The gain measurement values are compared with the 1/L threshold behavior versus temperature, indicating a nonlinear gain current dependence of injectorless devices.

Paper Details

Date Published: 1 November 2010
PDF: 5 pages
Opt. Eng. 49(11) 111107 doi: 10.1117/1.3498765
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
Simeon Katz, Walter Schottky Institute (Germany)
Augustinas Vizbaras, Walter Schottky Institute (Germany)
Gerhard Boehm, Walter Schottky Institute (Germany)
Markus-Christian Amann, Walter Schottky Institute (Germany)


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