提出一种基于液晶空间光调制器对涡旋相位进行相位恢复的方法，这有别于传统相位恢复算法。实验中利用液晶空间光调制器产生光学涡旋，再利用CMOS 摄像头来捕捉涡旋光斑。采用改进的GS 算法对系统相位进行恢复，算法中入射液晶面光振幅与随机输入相位结合进行迭代计算恢复液晶波阵面。因为程序经过多次迭代计算均恢复出涡旋相位，故证实该方法可进行相位恢复。通过计算得出系统的像差，同时利用泽尼克多项式对系统像差进行了定量分析。

We present a vortex phase retrieval method based on liquid crystal spatial light modulator. It's different from traditional phase retrieval method. In this method, a liquid crystal spatial light modulator is used to show the optical vortex phase, and a CMOS camera captures the donut image. A modified GS algorithm iteratively calculates the target phase with a random phase input and amplitude before LCD surface. The procedure recovers the vortex phase after several iterative calculation and it is confirmed that the method can be workable. Finally, we calculate the system optical aberration and quantitatively analyze the aberration by using Zernike decomposition.