红外与激光工程, 2019, 48 (7): 0706005, 网络出版: 2019-08-07   

采用条形光栅相位图的液晶空间光调制器的标定

Calibration of LC-SLM with strip grating phase image
作者单位
1 上海大学 机电工程与自动化学院, 上海 200072
2 中国科学院苏州生物医学工程技术研究所 江苏省医学光学重点实验室, 江苏 苏州215163
摘要
为了提高液晶空间光调制器(LC-SLM)的校准精度, 采用条形光栅相位图对LC-SLM进行了标定。首先基于傅里叶光学模拟计算得出了条形光栅相位图对比度与零级衍射光斑光强之间的对应关系, 然后搭建实验光路并在LC-SLM上加载了条形光栅相位图, 测量LC-SLM控制程序中加载的灰度图所对应的零级衍射光斑光强值, 经过分析计算得出计算机灰度信号与相位调制量之间的映射关系, 并最终得到了针对488 nm激光的LC-SLM的标定文件LUT。经过标定之后, 相位调制曲线的线性相关度可达0.996 4,校正误差仅为0.224 0 rad。结果表明, 在LC-SLM上加载复杂的高阶相位, 并结合LUT文件可以调制生成高质量的双螺旋光斑。此研究结果表明: 针对特定波长, 利用条形光栅相位图标定的LC-SLM得到的LUT文件可以使LC-SLM根据加载的相位对光束进行有效调制, 且其方法更简单。
Abstract
In order to improve calibration accuracy of the liquid crystal spatial light modulator (LC-SLM), strip grating phase image were proposed to calibrate the LC-SLM. Firstly, the relation between the phase contrast of the strip grating and the intensity of the zero-order diffraction spots was simulated based on Fourier optics. Then the experimental optical path was set up and the strip grating phase image was loaded on the LC-SLM to measure the relation between the gray level and the intensity of the zero-order diffraction spots. Through calculation and analysis, the relationship between the gray level and the amount of phase delay was obtained. And finally, calibration LUT file of LC-SLM for 488 nm laser was also obtained. After calibration, a higher linearity of 0.996 4, and a lower calibration error of 0.224 0 rad were got. The experimental results show that, the double-helical spot generated by the complex high-order phase was basically consistent with the simulation results when the LUT was presented on LC-SLM. The results show that for a specific wavelength, LUT file can be obtained by calibration of LC-SLM by using the strip grating phase image and the beam can be modulated effectively according to the loading phase image, and the method is simpler.

王发民, 张运海, 黄维, 缪新, 郭红卫. 采用条形光栅相位图的液晶空间光调制器的标定[J]. 红外与激光工程, 2019, 48(7): 0706005. Wang Famin, Zhang Yunhai, Huang wei, Miao Xin, Guo Hongwei. Calibration of LC-SLM with strip grating phase image[J]. Infrared and Laser Engineering, 2019, 48(7): 0706005.

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