纯相位菲涅尔全息图的反馈迭代算法及其硅基液晶显示

Iterative Feedback Algorithm for Phase-only Fresnel Hologram and Display Using Liquid Crystal on Silicon

研究了纯相位菲涅尔计算全息图的制作方法,给出了一种生成纯相位菲涅尔计算全息图的算法.首先研究了菲涅尔衍射的数值模拟算法,分析了两种数值模拟算法的计算速度.将计算速度较快的菲涅尔衍射数值模拟算法和迭代算法相结合,并引入比例反馈,得到纯相位菲涅尔计算全息图的反馈迭代算法.其次,对比例反馈系数的选取进行了实验研究,得到其最优经验值范围,然后进行了仿真实验.仿真结果表明,该算法降低了重构误差,提高了全息图重构质量.最后基于新型空间光调制器反射型硅基液晶,建立了全息显示光电实验系统,对该算法进行了验证.

A method of produce phase-only Fresnel Computer Generated Hologram （CGH） was researched, and an algorithm for the phase-only Fresnel CGH was presented. Firstly, numerical simulation algorithm of Fresnel diffraction was studied. Computation speed of two numerical simulation algorithms was analyzed. The iterative feedback algorithm of phase-only Fresnel CGH was obtained by combination of the iterative algorithm and Fresnel diffraction numerical simulation algorithms and the proportional feedback. Secondly, experimental research of selection of proportional feedback factor k was given and the optimal empiric value of k was obtained. Simulation results show that reconstruction noise is reduced and the quality of the reconstructed image is improved. Finally, an experimental system for hologram display based on liquid crystal on silicon was built and the algorithm was verified by the optoelectronic experiment.