Abstract

Accurate phase-locked 3: 1 division of an optical frequency was achieved (3ω→2ω+ω), by using continuous-wave, diode laser pumped, doubly resonant optical parametric oscillators (DRO). A periodically poled lithium niobate (PPLN) is used as a nonlinear crystal. The generated idler wave (2.53µm) is externally frequency doubled and the resulting beat with the signal wave (1.26µm) used to phase-lock the DRO. A fractional frequency stability of 2×10⁻¹⁷ of the division process has been achieved for 100 s integration time.

© 2000 Optical Society of America