Novel phase-locking schemes for the carrier envelope offset frequency of an optical frequency comb

摘要

We propose simple schemes to phase-lock the carrier envelope offset frequency (f_(ceo)) referring to the repetition rate (f_(rep)) of an optical frequency comb. We demonstrate the locking of f_(ceo) such that f_(ceo) = (1/2)f_(rep), (1β)f_(rep). and (2/3)f_(rep). The Allan deviation and signal-to-noise ratio of the coherent 5-function peak for the in-loop beat signal are 5.3 × 10~(-17)/τ and 80-85 dB·Hz, respectively, where τ is the averaging time of the frequency measurement. These new locking schemes simplify the sign and mode-number determination in frequency measurements.