Abstract
Since the first demonstration of distributed feedback quantum (DFB) quantum cascade (QC) lasers in 1997 [1] tremendous progress has been made in the development of single-mode emitting QC lasers [2-4]. Such kind of devices are of particular interest because a lot of different molecules, like CO2, N2O or CH4, have their fundamental modes in the mid-infrared spectral region (3-12 μm).
© 2013 IEEE
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