Holographic 3D display using Fraunhofer diffraction with occlusion effect

Abstract

Computer-generated holography is a key technology for three-dimensional (3D) visualization for its capability of true-to-life recreation of the recorded 3D scenes. Although multiple holographic algorithms have recently made impressive progress, high-quality 3D holographic display using Fraunhofer diffraction, which is characterized by long-distance reconstruction and fast calculation, has not been adequately investigated. In this paper, a layer-based computer-generated holographic algorithm based on Fraunhofer diffraction with digital lens phase (DLP) and occlusion effect for improved 3D holographic display is proposed. In order to relocate the reconstructed image plane, a lens group composed of the DLP and a real converging lens is utilized. Both simulated and experimental results verify the feasibility of the method for reconstructing 3D scenes in high quality with long diffraction range and corrected 3D perception. This method is envisioned to find itself important applications in future holographic 3D schemes, such as holographic 3D display applying neural networks since Fraunhofer diffraction is the most computationally saving in all diffraction methods.