High power thermoelectrically cooled and uncooled quantum cascade lasers with optimized reflectivity facet coatings

Maulini, Richard; Lyakh, Arkadiy; Tsekoun, Alexei; Go, Rowel; Pflügl, Christian; Diehl, Laurent; Capasso, Federico; Patel, C. Kumar N.
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p151112
Academic Journal
We present a method of preserving the device wall-plug efficiency by adjusting mirror losses with facet coatings for longer cavity quantum cascade lasers. An experimental study of output power and wall-plug efficiency as functions of mirror losses was performed by varying the front facet coating reflectivity with a high-reflectivity-coated rear facet. The use of optimized reflectivity coatings on 7-mm-long chips resulted in continuous-wave output power of 2.9 W at 293 K for thermoelectrically cooled devices mounted on AlN submounts and average and continuous-wave output power in excess of 1 W for uncooled devices emitting at 4.6 μm.


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