We introduce a novel broadband optical frequency comb generator consisting of a parametric oscillator with an intracavity electro-optic phase modulator. The parametric oscillator is pumped by 532-nm light and produces near-degenerate signal and idler fields. The modulator generates a comb structure about both the signal and the idler. Coupling between the two families of modes results in a dispersion-limited comb that spans 20 nm (5.3 THz). A signal-to-noise ratio of >30 dB in a 300-kHz bandwidth is observed in the beat frequency between individual comb elements and a reference laser.
© 1999 Optical Society of America
Scott A. Diddams, Long-Sheng Ma, Jun Ye, and John L. Hall, "Broadband optical frequency comb generation with a phase-modulated parametric oscillator," Opt. Lett. 24, 1747-1749 (1999)