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Considerable progress has been made in research on mid-infrared semiconductor lasers in terms of their maximum operating temperature and output power. Antimonide-based quantum-well lasers have exhibited continuous wave operation at 2.0 μm up to 400 K, at 2.7 μm to 234 K, at 3.5 μm to 175 K, and at 3.9 μm to 128 K. Diode lasers utilizing type-II transitions have exhibited lasing between 3 μm and 4...
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