光纤激光阵列相干合束的研究

摘要

Coherent beam was an important method to obtain high power and high beam quality laser .In order to analyze the characteristics of fiber laser beam combination , influence of fiber laser array structure , phase random jitter , fiber spacing , transmission distance and other factors on coherent combination was discussed by comparing the intensity distribution at different propagation distance .Power in the bucket for coherent beam was evaluated .The result shows that intensity distribution of different fiber laser array is different when the propagation distance is near .Intensity distribution is close to Gaussian distribution with the increasing of propagation distance .The number of the maximum intensity distribution points in the axis has the close relationship with the circular number of fiber laser array .The coherent effect is better if the random phase difference of the laser array is smaller.These results are reference to the study of fiber laser coherent combination .%相干合束是获得高功率、高光束质量激光的一种重要方法。为了分析光纤激光合束的特点，通过对相干合束不同传输距离光强分布特点的模拟对比，研究了光纤激光阵列结构、相位随机抖动、光纤间距、传输距离等因素对相干合成的影响，分析了相干合成时桶中功率随传输距离的变化。结果表明，相干合成时，不同光纤激光阵列结构在传输距离较近位置光强分布差别很大；随着传输距离增加，光强分布基本都接近高斯分布；轴上点光强分布极大值个数和阵列结构环数紧密联系；各光束之间的随机相位差越小，相干合成效果越好。这些结果对光纤激光相干和束的实验研究有一定的参考价值。