液晶空间光调制器（LCSLM）加载计算全息图实现激光分束时，会在焦平面处产生零级光干扰，为了解决这一情况，提出一种加载达曼光栅灰度图至液晶空间光调制器的方法，利用相消干涉，从而消除零级光干扰。基于模拟退火算法，求解出相位转折点集，在VirtualLab中进行仿真模拟，利用MATLAB软件编写生成达曼光栅灰度图的脚本文件，搭建基于硅基液晶空间光调制器（LCOSSLM）的验证系统，对调制效果进行测验。结果表明：通过加载达曼光栅灰度图进行激光分束，在CCD视场内明显去除了零级光干扰，且实际分束效果与仿真模拟结果相近，在一维五分束下的分束均匀度达97.190%，优于GSW算法生成的光栅形式全息图的调制效果。以大光点间距进行一维二、七分束的效果观测，分束均匀度分别达98.453%、96.820%，又进行二维分束观测，测量分束均匀度可达95.436%，且均未在CCD视场内观测到零级光。

Zero-order beam interference is generated at the focal plane when the liquid crystal spatial light modulator (LCSLM) is loaded with a computer-generated hologram (CGH) during laser beam splitting. To address this issue, we proposed to load a Dammann grating grayscale map to LCSLM using phase extinction interference, thereby removing zero-order beam interference. Based on the simulated annealing algorithm, the set of phase turning points was solved; simulations were performed in VirtualLab; and a script for generating Dammann grating grayscale maps was written using MATLAB software. Consequently, a verification system was built based on a liquid crystal on silicon spatial light modulator (LCOSSLM), and its modulation effect was tested. The results show that the zero-order beam interference is removed in the CCD field of view by loading the Dammann grating grayscale map for laser beam splitting. Moreover, the actual beam-splitting effect is close to that observed in the simulation results. Furthermore, the beam-splitting uniformity under one-dimensional five-beam splitting reaches 97.190%, which is better than the modulation effect of the grating CGH generated by the GSW algorithm. When the focal distance is large, effects of one-dimensional two- and seven-beam splitting are observed with beam-splitting uniformity levels of 98.453% and 96.820% respectively. The two-dimensional beam splitting is also observed with a measured beam-splitting uniformity of 95.436%. In addition, no zero-order beam is observed in the CCD field of view.