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In this Letter, we report phase-matched four-wave mixing separated by overone-octave in a dispersion engineered crystalline microresonator. Experimentaland numerical results presented here confirm that primary sidebands weregenerated with a frequency shift up to 140 THz, and that secondary sidebandsformed a localized comb structure, known as a clustered comb in the vicinity ofthe primary sidebands. A theoretical analysis of the phase-matching conditionvalidated our experimental observations, and our results good agree well withnumerical simulations. These results offer the potential to realize a frequencytunable comb cluster generator operating from 1 um to mid-infrared wavelengthswith a single and compact device.

Octave-wide phase-matched four-wave mixing in dispersion engineered crystalline microresonators