Bloch gain in quantum cascade lasers at high temperature

Gresch, Tobias; Terazzi, Romain; Faist, Jérôme; Giovannini, Marcella
January 2009
Applied Physics Letters;1/19/2009, Vol. 94 Issue 3, pN.PAG
Academic Journal
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.


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