Continuous operation over 1500 h at 77 K has been achieved by use of a PbTe/Pb0.93Sn0.07Te double-heterostructure laser which was grown using the liquid-phase-epitaxy method. The cw threshold current changed only about 3% during the first 200 h. It is concluded that the lifetime of PbTe/PbSnTe double-heterostructure lasers at 77 K is fundamentally very long.
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YOSHIKAWA et al. (1977) studied this question.
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