Abstract
After more than two decades of development quantum cascade lasers (QCL) [1] have become the most important and promising laser source in the mid and far infrared wavelength range. QCLs can provide high wall plug efficiency, excellent beam quality and huge dynamic wavelength range [2]. They also found a number of applications in sensing as many chemical species of interest have strong basic absorption that allows them to be detected and identified. The infrared region of the spectrum is very interesting for free-space optical communication because the atmosphere is fairly transparent at LWIR (8-12 micron) wavelengths.
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