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We demonstrated an array of distributed feedback quantum cascade lasers covering a spectral range of 220 cm-1. The variability in threshold current and slope efficiency is explained in terms of the position of the laser end facets.
We present a novel method for the thermal tuning of a grating-free mid-IR QCLs utilizing the absorbance changes of a thermochromic cladding. Both higher tuning coefficients as well as thermostable emission are achievable.
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