激光器阵列的部分相干性对相干合成远场输出特性的影响

对于相干合成的光纤激光器阵列来说，如何定量的分析阵列的相干性对于评价阵列的性能具有极其重要的意义.文章推导了光纤激光器阵列部分相干合成远场强度分布的解析表达式，详细探讨了激光器阵列的部分相干性对相干合成远场图样分布、中心主瓣宽度、斯特列尔比、桶中功率的影响.最后采用主振荡并联放大器方案对三路掺镱光纤放大器进行实时相位探测与校正，实验给出了三路光纤放大器相干合成的结果. 关键词： 光纤激光器阵列 相干合成 相干度

Effect of partial coherence laser arrays on far-field output properties

Quantitative details about coherence are important for determining the performance of laser arrays. In this paper, we deduce the analytical equation of the far-field intensity distribution in partially coherent combining of fiber laser arrays and investigate its effects on the far-field patterns, the FWHM of the central far-field lobe, strehl ratio and power in the bucket. The master oscillator-power amplifier scheme was used to realize phase control of three ytterbium fiber amplifiers, and the experimental results are presented.