Schweyer S M, Eder B, Putzer P, Mayerbacher M, Lemke N, Schreiber K U, Hugentobler U, Kienberger R
Opt Express. 2018 Sep 3;26(18):23798-23807. doi: 10.1364/OE.26.023798.
We demonstrate the stabilization of an all-in-fiber polarization maintaining semi-conductor saturable absorber mirror (SESAM) mode locked frequency comb oscillator with an intra-cavity waveguide electro-optic phase modulator (EOM) to a narrow linewidth HeNe laser over 46 hours. The high feedback bandwidth of the EOM allows a coherent optical lock with an in-loop integrated phase noise of 1.12 rad (integrated from 10 Hz to 3 MHz) from the carrier signal. No piezo fiber stretcher was required to guarantee long-term stabilization, preventing mechanical degradation of the optical fibers and enabling a long lifetime of the oscillator. As an application a hybrid stabilization scheme is presented, where a comb tooth is phase locked to a longitudinal mode of the large ring laser "G" located at the Geodatic Observatory Wettzell. The hybrid stabilization scheme describes the optical lock of the frequency comb to the G laser and the simultaneous compensation of the ring laser frequency drift by comparing the comb repetition rate against an active H-maser reference. In this context the ring laser reached a fractional Allan deviation of 5 · 10 at an integration time of 16384 s.
我们展示了一种全光纤保偏半导体可饱和吸收镜（SESAM）锁模频率梳振荡器，通过腔内波导电光相位调制器（EOM）在46小时内稳定到窄线宽氦氖激光器。EOM的高反馈带宽允许与载波信号实现相干光学锁定，环路内积分相位噪声为1.12弧度（从10赫兹积分到3兆赫兹）。无需压电光纤拉伸器即可保证长期稳定，防止光纤机械退化并延长振荡器的使用寿命。作为一种应用，提出了一种混合稳定方案，其中一个梳齿被锁相到位于大地测量天文台韦茨尔的大环激光器“G”的纵向模式。该混合稳定方案描述了频率梳对G激光器的光学锁定，以及通过将梳齿重复率与有源氢脉泽参考进行比较来同时补偿环形激光器的频率漂移。在此背景下，环形激光器在16384秒的积分时间内达到了5·10的分数阿仑偏差。
