TITLE

Bloch gain in quantum cascade lasers at high temperature

AUTHOR(S)
Gresch, Tobias; Terazzi, Romain; Faist, Jérôme; Giovannini, Marcella
PUB. DATE
January 2009
SOURCE
Applied Physics Letters;1/19/2009, Vol. 94 Issue 3, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 T0 parameter between 260 and 360 K are accompanied by a gain coefficient that depends weakly on temperature.
ACCESSION #
36339329

 

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