Abstract
The authors report the fabrication of high-power strained quantum cascade lasers working in continuous mode above 370K. The devices, processed in narrow buried heterostructures, were grown by low-pressure metal organic vapor-phase epitaxy. Continuous wave output power as high as 312mW at 300K was obtained at a wavelength of 5.29μm from a 3.25mm long, 7.5μm wide laser with a high-reflectivity back facet coating. The slope efficiency was in excess of 1.5W∕A and the power conversion efficiency reached almost 5%.
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