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We present an experimental study of optical frequency comb generation basedon cascaded quadratic nonlinearities inside a continuous-wave-pumped opticalparametric oscillator. We demonstrate comb states which producenarrow-linewidth intermode beat note signals, and we verify the mode spacinguniformity of the comb at the Hz level. We also show that spectral quality ofthe comb can be improved by modulating the parametric gain at a frequency thatcorresponds to the comb mode spacing. We have reached a high average outputpower of over 4 W in the near-infrared region, at ~2 {\mu}m.

Spectral characterization of a frequency comb based on cascaded quadratic nonlinearities inside an optical parametric oscillator