掺镱光学频率梳噪声抑制与载波包络相位锁定

Phase noise suppression and feedback control of carrier-envelope phase in an Yb-doped fiber frequency comb

本文研究了泵浦源功率稳定性、环境温度和机械振动等因素对掺镱光纤光学频率梳自由运转下的载波包络偏移相位的影响,基于锁相环伺服反馈系统实现了光学频率梳的载波包络相位锁定.实验中采用重复频率为60 MHz的掺镱光纤飞秒激光器,经过两级功率放大、光谱展宽和f-2f拍频探测系统,获得了信噪比为25 dB的拍频信号.在此基础上,由伺服反馈系统对载波包络相位信号进行控制,锁定后的载波包络相位信号的频率抖动标准方差为283 mHz(计数时间为0.5 h).

In this letter, we study the carrier envelope phase noise induced by the effects of LD-pump jitter, temperature change and mechanical vibration on an Yb-doped fiber frequency comb. Based on a home-made Yb-doped fiber oscillator with 60 MHz repetition rate, after two- stage amplifiers and a self-referenced f-2f measurement system, a beat signal with a signal to noise ratio of 25 dB is obtained. Further the frequency of carrier envelope phase signal is locked through phase-lock-loop electronics, a measured residual frequency jitter of 283 mHz is achieved in 0.5 h accumulation time.