采用条形光栅相位图的液晶空间光调制器的标定
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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。
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 zeroorder 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 highorder 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.
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 zeroorder 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 highorder 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.
引文
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[13]Xu Hao,Zhang Yunhai,Zhang Xin,et al.Calibration of LC-SLM with high bit depth phase gratings[J].Laser Technology,2017,41(4):515-520.(in Chinese)徐豪,张运海,张欣,等.结合高位深相位光栅图的LC-SLM标定[J].激光技术,2017,41(4):515-520.
[2]Wang Yukun,Hu Lifa,Wang Chongchong,et al.Modeling and control of Tip/Tilt Mirror in liquid crystal adaptive optical system[J].Optics and Precision Engineering,2016,24(4):771-779.(in Chinese)王玉坤,胡立发,王冲冲,等.液晶自适应光学系统中倾斜镜的建模与控制[J].光学精密工程,2016,24(4):771-779.
[3]Zeng Zhenxiang,Zheng Huadong,Lu Xiaoqian,et al.Viewing angle enlargement in holographic 3D display by spatial light modulators tiling in curved configuration[J].Chinese Optics,2015,8(2):227-233.(in Chinese)曾震湘,郑华东,卢小仟,等.空间光调制器曲面拼接实现全息三维显示视角拓展[J].中国光学,2015,8(2):227-233.
[4]Liang Yansheng,Yao Baoli,Ma Baiheng,et al.Holographic optical trapping and manipulation based on phase-only liquid-crystal spatial light modulator[J].Acta Optica Sinica,2016,36(3):0309001.(in Chinese)梁言生,姚保利,马百恒,等.基于纯相位液晶空间光调制器的全息光学捕获与微操纵[J].光学学报,2016,36(3):0309001.
[5]Guan Shu,Wang Chao,Tong Shoufeng,et al.Optical antenna design of off-axis two-mirror reflective telescope with freeform surface for space laser communication[J].Infrared and Laser Engineering,2017,46(12):1222003.(in Chinese)关姝,王超,佟首峰,等.空间激光通信离轴两镜反射望远镜自由曲面光学天线设计[J].红外与激光工程,2017,46(12):1222003.
[6]Yang Chenglong,Yan Changxiang,Yang Yufei.Isolation of optical antenna of inter-satellites laser communication terminals[J].Chinese Optics,2017,10(4):462-468.(in Chinese)杨成龙,颜昌翔,杨宇飞.星间激光通信终端光学天线的隔离度[J].中国光学,2017,10(4):462-468.
[7]Cheng Hong,Lv Qianqian,Wei Sui,et al.Rapid phase retrieval using SLM based on transport of intensity equation[J].Infrared and Laser Engineering,2018,47(7):0722003.(in Chinese)程鸿,吕倩倩,韦穗,等.基于光强传输方程与SLM的快速相位恢复[J].红外与激光工程,2018,47(7):0722003.
[8]Xu Ning,Fu Yuegang,Pu Dong.Research and design of single lens high resolution imaging system[J].Infrared and Laser Engineering,2017,46(11):1118001.(in Chinese)徐宁,付跃刚,浦东.单透镜高分辨成像系统的研究和设计[J].红外与激光工程,2017,46(11):1118001.
[9]Ren Xiuyun,Cai Chunwei,Wang Yi,et al.The phase modulation properties measurement of LCSLM by common-path lateral shearing interferometry[J].Acta Photonica Sinica,2007,36(5):899-904.(in Chinese)任秀云,蔡春伟,王翥,等.横向剪切干涉法共路测量LCSLM的相位调制特性[J].光子学报,2007,36(5):899-904.
[10]Li Dahai,Tan Zefu,Chen Huaixin,et al.Measuring LCTV′s phase modulation characteristics based on cyclic radial shearing interferometer[J].Acta Photonica Sinica,2002,31(8):970-974.(in Chinese)李大海,谭泽富,陈怀新,等.采用环路径向剪切干涉法测量液晶电视的相位调制特性[J].光子学报,2002,31(8):970-974.
[11]Cox I J,Miller M L.A review of watermarking and the importance of perceptual modelling[C]//SPIE,1997,3016:92-99.
[12]Kong Ningning,Li Chao,Xia Mingliang,et al.Light modulator by mask-phase method[J].Acta Optica Sinica,2011,31(3):0305002.(in Chinese)孔宁宁,李抄,夏明亮,等.Mask相位法校准液晶空间光调制器的相位调制特性[J].光学学报,2011,31(3):0305002.
[13]Xu Hao,Zhang Yunhai,Zhang Xin,et al.Calibration of LC-SLM with high bit depth phase gratings[J].Laser Technology,2017,41(4):515-520.(in Chinese)徐豪,张运海,张欣,等.结合高位深相位光栅图的LC-SLM标定[J].激光技术,2017,41(4):515-520.