  We report on the fabrication of high-Q, fused-quartz microresonators and the
parametric 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 and
frequency domains to assess its suitability for future precision metrology
applications. Intensity autocorrelation measurements and line-by-line comb
control reveal near-transform-limited picosecond pulse trains that are
associated with good relative phase and amplitude stability of the comb lines.
The comb's 36 GHz line spacing can be readily photodetected, which enables
measurements of its intrinsic and absolute phase fluctuations.
