本文提出了一种利用纯相位型液晶空间光调制器(LC-SLM)实现相息图三维显示的方法。该方法以LC-SLM为显示器件,通过相息图的衍射进行三维像的重构。详细研究了相息图的计算及其与LC-SLM 参数间的关系,并对再现像像质进行了讨论。为提高显示的空间分辨率,采用分时复用技术,对三维物体进行分组取样,并计算每一分组的相息图,形成分组相息图序列,再现时依次将相息图输入到LC-SLM,利用人眼的视觉残留效应以达到连续扫描三维成像的目的。实验结果表明,该方法实现了三维物体的再现,为三维显示提供了一种有效的方法。

An effective method for three-dimensional (3D) imaging with kinoform based on reflective phase-only Liquid Crystal Spatial Light Modulator (LC-SLM) was proposed. 3D image actually was reconstructed by the diffraction of kinoform using LC-SLM as a display unit. The calculation of kinoform, the relationships between parameters of LC-SLM with the kinoform, and some influencing factors in the quality of the reconstructed image were discussed in detail. In order to enhance the displaying resolution, a displayed object was decomposed into several sampling groups, and the corresponding kinoforms were calculated. When the kinoforms were inputted into LC-SLM successively within residual time of human eyes, the diffraction light wave may reconstruct the image of the original object, and then an observer can see a 3D image in free space. Experimental results demonstrate the correctness of the proposed approach, which provides an effective way for 3D display in practical application.