液晶空间光调制器是改善空间光束质量的有效方法,提出了一种空间光强度整形迭代算法。在复杂结构的激光系统中, 利用前级小口径液晶空间光调制器的主动控制光束振幅的方法, 补偿了后级激光系统的50 m传输距离的空间不均匀性, 实现了系统末级近场分布均匀激光输出。实验结果表明, 液晶空间光调制器能很好的改善近场光束质量, 整形输出光束通量调制度达到1.26:1, 通量对比度达到5.1%, 光束边缘软化因子为8.1%, 与目标光斑的近场相似度达到99.83%。

Liquid crystal spatial light modulator (SLM) is an effective method to improve spatial beam quality. A shaped iterative algorithm of spatial light intensity is proposed. The spatial non-uniform of the back-stage laser system with 50 m transmission distance is compensated in the complex high-power solid-state laser system by using a small-aperture liquid crystal SLM of the front stage. Experimental results show that nearfield beam quality can be improved by using SLM. After spatial beam shaping, the output nearfield modulation is 1.26:1, the fluence contrast value is 5.1%, the soft-edge factor is 8.1% and the nearfield similarity to the target beam is 99.83%.