Full-color holographic near-eye display employs an eyepiece lens to magnify 3D images, which are then recorded by adjusting the focus of the camera lens. A fast hologram is then generated using a Split-Lohmann lens-based diffraction algorithm. Credit: Chang et al., doi 10.1117/1.APN.3.3.036001

Holographic displays offer a promising avenue for achieving lifelike 3D reproductions with continuous depth sensation, holding potential applications in fields such as entertainment, medical imaging, and virtual reality. However, the conventional methods for generating computer-generated holograms (CGHs) rely on repetitive computations, leading to increased computational complexity and impracticality for real-time applications.

To tackle this issue, researchers from the University of Shanghai for Science and Technology (China) have introduced a novel method for CGH generation that significantly reduces computational overhead while maintaining high-quality 3D visualization. As reported in Advanced Photonics Nexus, their approach leverages a split Lohmann lens-based diffraction model, enabling rapid synthesis of 3D holograms through a single-step backward propagation calculation. By incorporating a specially designed virtual digital phase modulation into the split Lohmann lens, their method achieves highly accurate reconstruction of 3D scenes with precise depth perception.

The significance of this research lies in its potential to revolutionize the creation of holographic displays by offering a practical solution for real-time CGH generation. Unlike traditional methods that suffer from computational bottlenecks, the proposed approach ensures consistent computation speed regardless of the depth sampling density, thereby enabling seamless integration into various applications requiring immersive 3D visualization.

To validate the effectiveness of their method, the researchers conducted both simulations and experiments, demonstrating its ability to generate realistic 3D holographic displays with accurate depth perception.

Overall, the study presents a promising advancement in the field of computer-generated holography, offering a practical solution for creating immersive 3D visualizations without the computational limitations of traditional methods. It helps pave the way for the widespread adoption of holographic displays in diverse industries and applications.

For details, see the original Gold Open Access article by C. Chang et al., “Split Lohmann computer holography: fast generation of 3D hologram in single-step diffraction calculation,” Adv. Photon. Nexus 3(3), 036001 (2024), doi 10.1117/1.APN.3.3.036001