High-quality and efficient phase-only hologram generation method based on complex amplitude constrained Gerchberg-Saxton algorithm☆

The holographic display garners widespread attention for its ability to provide vivid and realistic 3D visuals. The Gerchberg-Saxton (GS) algorithm has played a significant role in computer-generated holography for many years. However, the conventional GS algorithm cannot meet the requirements of holographic display for highquality and realistic visual effects. In this paper, a phase-only hologram generation method is proposed based on the complex amplitude constrained GS (CAC-GS) algorithm. In the proposed method, all information of the 3D scene is precalculated as a complex amplitude field at a target plane, and then the CAC-GS algorithm is used to reconstruct the target complex amplitude field and generate the hologram. The proposed method constrains both amplitude and phase on a target plane, thus significantly improving the image quality and efficiency of the hologram generation. Compared with the conventional GS algorithm, the holographic image quality of the proposed method is improved by approximately 50 %, and the calculation time is reduced by 97.27 %. This novel algorithm holds great promise for a wide range of applications including AR and VR.