Split Lohmann computer holography: fast generation of 3D hologram in single-step diffraction calculation

作者：Chenliang Chang, Xian Ding, Di Wang, Zhizhou Ren, Bo Dai, Qi Wang, Songlin Zhuang, Dawei Zhang · 发表于：Advanced Photonics Nexus · 年份：2024 · DOI：10.1117/1.apn.3.3.036001 · 被引用次数：19 · 研究领域：Advanced Optical Imaging Technologies、Digital Holography and Microscopy、Metamaterials and Metasurfaces Applications

Holographic display stands as a prominent approach for achieving lifelike three-dimensional (3D) reproductions with continuous depth sensation. However, the generation of a computer-generated hologram (CGH) always relies on the repetitive computation of diffraction propagation from point-cloud or multiple depth-sliced planar images, which inevitably leads to an increase in computational complexity, making real-time CGH generation impractical. Here, we report a new CGH generation algorithm capable of rapidly synthesizing a 3D hologram in only one-step backward propagation calculation in a novel split Lohmann lens-based diffraction model. By introducing an extra predesigned virtual digital phase modulation of multifocal split Lohmann lens in such a diffraction model, the generated CGH appears to reconstruct 3D scenes with accurate accommodation abilities across the display contents. Compared with the conventional layer-based method, the computation speed of the proposed method is independent of the quantized layer numbers, and therefore can achieve real-time computation speed with a very dense of depth sampling. Both simulation and experimental results validate the proposed method.