Laser emission in HgCdTe in the 2-3.5 um range

摘要

Stimulated emission from HgCdTe separate confinement heterostructure waveguides embedding quantum wells as gain medium is stuided. We explore the effect of composition grading in the barriers as well as that of using strained quantum wells on the temperature evolution of the laser threshold. The main effect of barrier grading is to suppress carrier trapping at low temperarues, leading to an improved excitation transfer from the barriers to the quantim wells, and to an intrinsic exponential dependence of the threshold on the temperature.