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We report on the fabrication of high-Q, fused-quartz microresonators and theparametric generation of a frequency comb with 36 GHz line spacing using them.We have characterized the intrinsic stability of the comb in both the time andfrequency domains to assess its suitability for future precision metrologyapplications. Intensity autocorrelation measurements and line-by-line combcontrol reveal near-transform-limited picosecond pulse trains that areassociated with good relative phase and amplitude stability of the comb lines.The comb's 36 GHz line spacing can be readily photodetected, which enablesmeasurements of its intrinsic and absolute phase fluctuations.

Spectral and temporal characterization of a fused-quartz microresonator optical frequency comb