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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 2.9W at 293K for thermoelectrically cooled devices mounted on AlN submounts and average and continuous-wave output power in excess of 1W for uncooled devices emitting at 4.6μm.
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Maulini et al. (2009) studied this question.
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