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选取不同路数和不同填充因子的合成光束模型,模拟并分析了倾斜相差对相干合成的影响.介绍了倾斜校正的关键器件——自适应光纤光源准直器.在主振荡功率放大器结构的光纤激光相干合成系统中,模拟了随机并行梯度下降(SPGD)算法校正七路激光阵列间时变倾斜相差的动态过程,分析了不同倾斜相差幅值和频率对校正能力的影响.实验表明,要提高相干合成的效果,必须校正倾斜相差;而SPGD算法校正倾斜相差的能力随着倾斜相差幅值和频率的增加而降低.文章为在实际大气环境中实现多路高功率光纤激光的相干合成提供了参考.
The synthetic beam model with different number of paths and different fill factors was chosen to simulate and analyze the influence of tilt difference on coherent synthesis.The key component of tilt correction was introduced - adaptive fiber light source collimator.In the main oscillation power amplifier fiber In the laser coherent synthesis system, we simulate the dynamic process that the SPGD algorithm corrects the time-varying gradient between seven laser arrays, and analyze the influence of amplitude and frequency of different tilt phase differences on the correction ability.The experiment shows that it is necessary to improve The effect of coherent synthesis must be corrected for skew and the ability of the SPGD algorithm to correct for skew decreases with increasing amplitude and frequency of skew.The article provides a method for coherent synthesis of multiple high power fiber lasers in real atmospheric conditions reference.