Abstract
The mid-infrared spectral range (λ~2–20 mm) is of particular importance as many molecules exhibit strong vibrational fingerprints in this region. Optical frequency combs [1, 2]—broadband optical sources consisting of equally spaced and mutually coherent sharp lines—are creating new opportunities for advanced spectroscopy [3, 4, 5]. Here we demonstrate a novel approach to create mid-infrared optical frequency combs via four-wave mixing [6, 7] in a continuous-wave pumped ultra-high Q crystalline microresonator made of magnesium fluoride
© 2013 IEEE
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