Distributed feedback Pb1−xSnxTe double-heterostructure lasers grown by molecular-beam epitaxy with cw operation up to 50 K are reported. The grating of 1.1-μm periodicity operates in the first Bragg order near 800 cm−1 (12.5 μm). Single-mode operation is obtained over a wide range of diode current and heat-sink temperature. Continuous current tuning of mode frequency up to 7 cm−1 is obtained, and by varying both diode current and heat-sink temperature complete coverage of the range 795–806.5 cm−1 is demonstrated.
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Walpole et al. (1977) studied this question.
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