对利用随机并行梯度下降(SPGD)算法对多路光纤放大器相干合成进行了数值模拟,并进行了两路瓦级光纤放大器相干合成的实验。实验结果表明,SPGD算法能够有效控制各路光纤激光的相位,系统闭环将目标圆孔内的能景提高了1.57倍;并使得目标圆孔内能量大于理想值8O%的概率从27.7%提升到了70.3%。取得了较为明显的相干合成效果。对算法用于多路高功率光纤放大器相干合成的可行性进行了探讨。 The coherent combination of multiple optical fiber amplifiers was simulated by the Stochastic Parallel Gradient Degradation (SPGD) algorithm and the coherent combination experiment of two watt-class fiber amplifiers was carried out. Experimental results show that the SPGD algorithm can effectively control the phase of each fiber laser. The closed loop of the system can increase the energy of the target hole by 1.57 times. The probability that the target hole energy is greater than 80% of the ideal value is increased from 27.7% 70.3%. Obtained a more obvious coherent synthesis effect. The feasibility of the algorithm for multi-channel high-power fiber amplifier coherent synthesis is discussed.