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对电寻址振幅型空间光调制器(SLM)在高功率激光系统中存在的问题进行了分析.理论分析了电寻址空间光调制器的黑栅效应对光束近场光束整形效果的影响,提出了通过优化空间滤波器的小孔参数获得最佳整形效果的技术方案,并计算了小孔滤波后的能量利用率.同时,分析了液晶空间光调制器的开口率对光束整形的影响,为了提升近场整形精度,空间光调制器的开口率最好大于64%.研究了纯振幅型空间光调制器调制过程中引入的相位畸变,从理论分析和实验验证两方面得出了附加相位分布图,计算得出最大附加相位为0.226λ.
The problems existing in the high power laser system of the electrically addressed amplitude spatial light modulator (SLM) are analyzed.The influence of the black-gate effect of the electrical addressable spatial light modulator on the beam shaping effect of the beam is analyzed theoretically, The technical scheme of obtaining the best shaping effect by optimizing the aperture parameters of the spatial filter is proposed and the energy utilization efficiency of the aperture filtering is calculated.At the same time the influence of the aperture ratio of the liquid crystal spatial light modulator on the beam shaping is analyzed, In order to improve the accuracy of near-field shaping, the aperture ratio of spatial light modulator is better than 64% .In this paper, the phase distortion introduced in the modulation of pure amplitude spatial light modulator is studied, and the additional phases are derived from theoretical analysis and experimental verification Distribution, calculated maximum additional phase 0.226λ.