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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。
A method of phase recovery of vortex phase based on liquid crystal spatial light modulator is proposed, which is different from the traditional phase recovery algorithm. In the experiment, a liquid crystal spatial light modulator is used to generate the optical vortex, and then the CMOS camera is used to capture the vortex spot. An improved GS algorithm is used to recover the phase of the system. The light amplitude of the incident liquid crystal plane and the random input phase are combined to calculate the liquid crystal wavefront. Because the program recovers the vortex phase after many iterative calculations, it is confirmed that the method can perform phase recovery. The aberrations of the system are calculated and the systematic aberrations are quantitatively analyzed by Zernike polynomials.