Abstract
Quantum Cascade Lasers (QCLs) are considered as one of the most versatile sources of light in the mid-IR spectral range. The need for mid-IR lasers not only emitting at precisely selected wavelengths but showing also a high spectral purity is now growing, driven by numerous possible applications such as high-resolution spectroscopy in the molecular fingerprint region, e. g. in combination with optical frequency combs.
© 2013 IEEE
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