Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3072343
Keywords
quantum cascade lasers; quantum well lasers
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Funding
- Swiss National Science Foundation
- National Center of Competence in Research, Quantum Photonics
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We performed multisection cavity gain measurements at high temperature with quantum cascade lasers that are based on a single quantum well active region and work in a low-inversion regime. A modal gain coefficient g=3.7 +/- 0.9 cm kA(-1) at 330 K is found for the sample with the lowest population inversion. We show that the weak dependence of the threshold current and the high values of the associated T(0) parameter between 260 and 360 K are accompanied by a gain coefficient that depends weakly on temperature.
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