Low threshold current high-temperature operation of InGaAs/AlGaAs strained-quantum-well lasers

The authors report improved high-temperature characteristics for In/sub 0.2/Ga/sub 0.8/As strained-quantum-well ridge waveguide lasers with an optimized cavity design. They have fabricated In/sub 0.2/Ga/sub 0.8/As lasers that operate CW at up to 220 degrees C with over 9-mW output power. At 200 degrees C the threshold current is as low as 15.9 mA for a 400- mu m-long laser with 35/98% reflectivity facets. Optimization of the laser cavity also improves the high-temperature operation of quantum-well lasers in other material systems; GaAs quantum well lasers that operate at up to 220 degrees C CW have been fabricated.<
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