纯相位型液晶空间光调制器是应用较广的高精度光学仪器。使用Holoeye 产家推荐的双孔干涉测量法可使16 阶闪耀光栅的1 级光衍射效率达到80%。但需要滤波、准直、扩束等细致工作，耗时较长。运用二进制相位光栅衍射法可以简化修正过程。实验中每隔10 个灰度值测一个点，利用Matlab 做线性内插扩展到255 灰度。使16 阶闪耀光栅和二进制光栅的1 级光衍射效率最终达到产家目录给出的83%和40%。修正结果证明5-5 序列配置的HoloeyePluto 的液晶光阀在平均调制相位稳定的基础上，衍射法校正相位调制特性不受闪烁影响，且简单可行。

The pure phase type of spatial light modulator (SLM) is a widely used high precision optical device. The double-hole interference method recommended by Holoeye can correct the phase to a result which has 80% of 1st diffractive efficiency for 16 level blazed grating. But the total process needs to be conducted carefully with filtering collimation, beam expanding etc., and it takes too long time. The diffractive method using binary grating can simplify the correction process. We make a measurement just every 10 gray level. The total 256 values are achieved by interpolation using Matlab. As a result, the 1st diffractive efficiency of 16 level blazed grating and binary grating reaches to the Holoeye catalog values of 83% and 40% respectively. The experiments prove that the diffractive method based on the stable averaged phase modulation of Holoeye Pluto SLM can correct the characteristic of SLM with simplicity and feasibility, and it is not limited by the phase flicker under 5-5 sequence configuration of SLM.