用于合成全息图拍摄的相位散射片的设计

龙涛; 钱可元

半导体光电, 2012, 33 (5): 735, 网络出版: 2012-11-01

用于合成全息图拍摄的相位散射片的设计

Design of Phase Diffuser for Synthetic Hologram

论文大纲

龙涛 ^*钱可元

作者单位

清华大学深圳研究生院半导体照明实验室, 广东深圳 518055

合成全息相位散射片 G-S算法 synthesis hologram phase diffuser G-S algorithm

摘要

介绍了合成全息图拍摄过程中图像的滤波处理过程, 并分析了利用透镜对图像信息进行会聚时光场的不均匀性问题。为改善会聚光场的均匀性, 通常需在透镜前设置弱散射片, 从理论上分析了相位散射片改善光场均匀性的原理, 基于该原理利用傅里叶迭代算法(G-S算法)对相位散射片的相位分布进行了设计, 并将所设计的相位片应用于实际图像进行了仿真分析。结果表明, 通过精确设计相位片的相位分布能极大地改善光场的均匀性, 且能在一定范围调整光斑尺寸的大小。最后针对相位片实际制作中相位的量化问题分析了量化误差的影响, 仿真结果表明, 当量化阶数达到8阶时量化误差的影响可以忽略。

Abstract

Described are the image filtering and processing during making a synthetic hologram, and analysed is the nonuniform field of the converging light by optical lens. To improve the uniformity of the converged field, a weak diffuser is often inserted before the lens. It is explained why the phase diffuser can improve the fields uniformity theoretically. Based on the theory, we designed the phase distribution of the phase diffuser was designed based on G-S algorthm and simulations were performed by attaching the phase distribution to a real image. The results show that the uniformity of the field can be greatly improved by the designed phase diffuser, and the plot size can even be adjusted in a certain scope. We finally discussed the influence when quatized the phase by different grades, and simulation results show when quantization grade reached eight the quantization error can be ignored.

参考文献

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龙涛, 钱可元. 用于合成全息图拍摄的相位散射片的设计[J]. 半导体光电, 2012, 33(5): 735. LONG Tao, QIAN Keyuan. Design of Phase Diffuser for Synthetic Hologram[J]. Semiconductor Optoelectronics, 2012, 33(5): 735.

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