设计并搭建了被动全光同步的全保偏光纤激光系统,该系统能够长时稳定输出时域精确同步的双色超快脉冲。被动同步系统包含两台基于非线性放大环形镜锁模的掺铒与掺镱全保偏光纤激光振荡器,采用主从注入式整体结构,借助注入脉冲在从激光谐振腔中引入的非对易非线性相移,获得了自适应同步的锁模脉冲输出。通过优化主激光注入脉冲能量和从激光器腔内滤波带宽等实验参数,获得了长达26 mm的腔长失配容忍度。该脉冲同步系统具有结构简单、即插即用、稳定性好、保偏输出等优点。

We have designed and constructed a synchronized fiber laser system in the all-optical and passive way, which enables to deliver dual-color ultrafast pulses with long-term stability and high timing precision. This synchronization system consisting of two Er- and Yb-doped fiber lasers mode-locked by nonlinear amplifying loop mirrors adopts a master-slave configuration. The injection pulse induces a non-reciprocal nonlinear phase shift within the laser resonator cavity, and thus an adaptively synchronous mode-locking output is realized. After optimizing the experimental parameters including pulse energy of master injection and filter bandwidth within laser resonator cavity, we achieved a 26 mm tolerance range of cavity-length mismatch. The pulse synchronization system here favors advantages such as simple structure, plug and play, good stability, and polarization-maintaining output.