中国激光, 2016, 43 (2): 0205005, 网络出版: 2016-01-25   

基于二维标量衍射的液晶光束偏转性能仿真

Beam Steering Performance Simulation of Liquid Crystal Spatial Light Modulator Based on 2D Scalar Diffraction
丁科 1,2,*亓波 1,2
作者单位
1 中国科学院光束控制重点实验室, 四川 成都 610209
2 中国科学院光电技术研究所, 四川 成都 610209
摘要
液晶空间光调制器(LCSLM)可用于光束偏转,针对一维衍射解析理论分析液晶光束偏转时仅能考虑衍射效率的问题,严格分析二维标量衍射数值方法的采样要求和算法实现,对液晶器件的相位调制级数和非线性进行建模,计算圆形光斑经过液晶器件和聚焦透镜后的光斑空间分布。仿真分析各种条件下液晶器件的衍射效率和偏转精度,得出不同偏转角度时相位调制级数与偏转精度和衍射效率的关系,为液晶器件的选择提供了依据。利用BNS256×256向列液晶构建光束偏转实验,同时也根据实验参数仿真分析不同偏转角度对应的偏转精度和衍射效率,实验结果与仿真基本吻合,表明二维标量衍射分析可用于液晶偏转器件的工程性能评估。
Abstract
Liquid crystal spatial light modulator (LCSLM) can be applied to beam steering. Considering that the one-dimensional scalar diffraction analytic method can only solve the diffraction efficiency, two-dimensional scalar diffraction numerical method is introduced and the sampling demand and realization algorithms are strictly analyzed. After phase stages and nonlinearity of LCSLM are modeled, the spatial distribution of circular beam through LCSLM and focus lens is calculated, diffraction efficiency and steering accuracy are simulated with variety of parameters. The relations between the stages and accuracy efficiency with different steering angles are concluded, which can provide choosing basis for liquid devices. Using BNS 256×256 liquid device, the beam steering experiment in which the accuracy and efficiency of different steering angles are researched is established and simulations according to experimental parameters are also done. The experimental and simulation results show good agreement, which demonstrates that two-dimensional scalar diffraction can be used for engineering performance evaluation of LCSLM device.

丁科, 亓波. 基于二维标量衍射的液晶光束偏转性能仿真[J]. 中国激光, 2016, 43(2): 0205005. Ding Ke, Qi Bo. Beam Steering Performance Simulation of Liquid Crystal Spatial Light Modulator Based on 2D Scalar Diffraction[J]. Chinese Journal of Lasers, 2016, 43(2): 0205005.

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