title: Long-term phase-locking technique for locking the repetition rate of an optical frequency comb laser with 1.67 × 10-19precision.
abstract: An ultrahigh stable phase-locked loop system for synchronization of an optical frequency comb to a hydrogen maser has been proposed and experimentally demonstrated. A mathematical model has been set up to investigate the feasibility and steady state of the phase-locking system. The fractional frequency instability is evaluated by measuring the mixed-phase signal of an improved experimental system. Experimental results show that the fractional frequency instability of the phase-locked loop system lies from 8.83×10-16at 1 s to 1.67×10-19at 1000 s, which indicates our proposed phase-locking system possesses ultrahigh measurement precision with good long-term stabilization performance.
authors.forename: Cheng
authors.initials: C
authors.lastname: Ci
authors.forename: Xuesong
authors.initials: X
authors.lastname: Zhang
authors.forename: Xinran
authors.initials: X
authors.lastname: Li
authors.forename: Xing
authors.initials: X
authors.lastname: Chen
authors.forename: Yifan
authors.initials: Y
authors.lastname: Cui
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Zhao
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Wu