We present a detailed study on the improvement of the performance of λ ∼ 9 μm quantum cascade lasers by using a metallic high reflectivity facet coating. Higher operating temperatures, lower operating currents and higher peak powers are all seen as a consequence for this relatively straightforward technology. Furthermore, a dramatic approximately fourfold increase of average power is observed when operated on a Peltier cooler at −30 °C.
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Page et al. (2002) studied this question.
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