Lr. Brothers et al., TERAHERTZ OPTICAL FREQUENCY COMB GENERATION AND PHASE-LOCKING OF AN OPTICAL PARAMETRIC OSCILLATOR AT 665 GHZ, Optics letters, 19(4), 1994, pp. 245-247
We have achieved efficient electro-optic phase modulation at high freq
uencies in a resonant modulator cavity. We enhance modulation by match
ing the phase velocities of the optical and microwave fields in the mo
dulator substrate and by placing the modulator inside an optical cavit
y that is resonant for the input optical beam and the generated sideba
nds. An optical frequency comb with a span of 3 THz and at a spacing o
f 17 GHz is generated with 1 W of microwave power. The terahertz comb
is utilized to phase lock an optical parametric oscillator at a signal
-idler difference frequency of 665 GHz.