提出了一种全光纤光程差自适应控制方法,并成功应用于飞秒光纤激光相干偏振合成系统。建立的光程差自适应控制系统以现场可编程门阵列(FPGA)控制电路为硬件基础,基于爬山法设计了有效的控制算法,成功解决了光程差自适应控制与锁相控制相互干扰的问题。实验结果表明,系统可以完全补偿±60λ范围内的光程差漂移,具有良好的连续工作稳定性,可以满足飞秒光纤激光相干偏振合成系统中光程差自适应控制的要求。 An all-fiber optical path difference adaptive control method is proposed and successfully applied to femtosecond fiber laser coherent polarization synthesis system. The established optical path difference adaptive control system based on field programmable gate array (FPGA) control circuit is used as the hardware foundation. Based on the hill-climbing method, an effective control algorithm is designed and the mutual interference between the optical path difference adaptive control and the phase-locked control is successfully solved problem. The experimental results show that the system can completely compensate the optical path difference shift within the ± 60λ range and has good continuous working stability, which can meet the requirements of adaptive optical path difference control in the femtosecond fiber laser coherent polarization synthesis system.