Zeng Zhenxiang, Zheng Huadong, Yu Yingjie, Asundi Anand K, Valyukh Sergiy
Appl Opt. 2017 May 1;56(13):F112-F120. doi: 10.1364/AO.56.00F112.
Among the important features of holographic displays are the wide viewing angles and the full color of the reconstructed images. The present work focuses on achievement of both features. We propose an increased-viewing-angle full-color holographic display using two tiled phase-only spatial light modulators (SLMs), a 4f concave mirrors system, and a temporal-spatial multiplexing method. The 4f optical system consists of two concave mirrors and serves to increase the viewing angle. A temporal-spatial multiplexing synchronization control (TSMSC) method is developed to achieve a full-color image and to remove the color crosstalk of the image. We calculate RGB phase-only holograms of a computer-generated color pyramid by using a slice-based Fresnel diffraction algorithm. The experimental results indicate that the proposed display system is feasible to reconstruct a full-color holographic 3D image with a viewing angle of 12.8°, which is about 3.8 times wider than the viewing angle formed by a single SLM.
全息显示器的重要特性包括宽视角和重建图像的全彩色。当前工作聚焦于实现这两个特性。我们提出一种使用两个拼接的纯相位空间光调制器（SLM）、一个4f凹面镜系统和一种时空复用方法的宽视角全彩色全息显示器。4f光学系统由两个凹面镜组成，用于增大视角。开发了一种时空复用同步控制（TSMSC）方法来实现全彩色图像并消除图像的颜色串扰。我们使用基于切片的菲涅耳衍射算法计算计算机生成的彩色金字塔的RGB纯相位全息图。实验结果表明，所提出的显示系统能够重建视角为12.8°的全彩色全息3D图像，该视角比单个SLM形成的视角宽约3.8倍。
