Abstract
We report on the generation of mid-infrared Kerr frequency combs in high-finesse and whispering-gallery-mode resonators pumped with continuous-wave room-temperature quantum cascade lasers. The combs were centered at 4.5 μm, the longest wavelength to date. A frequency comb wider than one half of an octave was demonstrated when approximately 20 mW of pump power was coupled to an resonator characterized with quality factor exceeding .
© 2015 Optical Society of America
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