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Published on: June 23, 2023
Tapered 4.7 μm quantum cascade lasers with highly strained active region composition delivering over 4.5 watts of
Arkadiy Lyakh1, Richard Maulini, Alexei Tsekoun
1Pranalytica, Inc., 1101 Colorado Ave., Santa Monica, California 90401, USA.
Abstract:
A strain-balanced, Al0.7In0.22As/In0.72Ga0.28As/InP quantum cascade laser structure, designed for light emission at 4.7µm using the non-resonant extraction design approach, was grown by molecular beam epitaxy. Laser devices were processed in tapered buried heterostructure geometry and then mounted on AlN/SiC composite submounts using hard solder. A 10 mm long laser with 7.5µm-wide central section tapered up to 20µm at laser facets generated over 4.5W of single-ended CW/RT optical power at 283K. Maximum wallplug efficiency of 16.3% for this laser was reached at 4W level. Reliability of over 2,000h has been demonstrated for an air-cooled system delivering optical power of 3W in a collimated beam with overall system efficiency exceeding 10%.
