Strained quantum-well diode lasers emitting at 3.9 μm have been fabricated. The laser structure, grown on a GaSb substrate by molecular beam epitaxy, consists of compressively strained InAsSb active layers and tensile-strained InAlAsSb barrier layers, surrounded by AlAsSb cladding layers. Broad-stripe lasers have exhibited pulsed operation up to 165 K, with threshold current density of 78 A/cm2 at 80 K. The characteristic temperature is 30 K up to 120 K. The devices operated cw up to 123 K, and the maximum cw power at 80 K is 30 mW/facet. Ridge-waveguide lasers have operated cw up to 128 K, with cw threshold current at 80 K of 35 mA.
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Choi et al. (1995) studied this question.