A. Savchenkov, V. Ilchenko, F. di Teodoro, P. Belden, W. Lotshaw, A. Matsko, L. Maleki
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Abstract
We report on generation of Kerr frequency combs centered at 4.55μm in high quality factor (Q) CaF2 whispering gallery mode (WGM) resonators pumped with quantum cascade lasers. A broad frequency comb is demonstrated when several mW of pumping light are coupled to a CaF2 WGM resonator characterized with Q > 107.
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