High-quality full-color 3D holography based on orbital angular momentum multiplexing

Computer-generated holograms (CGHs) have found extensive applications in three-dimensional (3D) display, information storage, beam shaping, and optical tweezers. Orbital angular momentum (OAM) introduces a new degree of freedom for hologram multiplexing, thereby unlocking novel potentials for CGH. However, due to the inaccurate intensity of the reconstructed pixels, the existing OAM holography can only reconstruct simple patterns. Here, we proposed a high-quality full-color 3D holography based on OAM multiplexing and a corresponding amplitude-phase hybrid iterative optimization algorithm. Our method multiplexes red, green, and blue light fields with different OAM modes onto a single OAM multiplex hologram (OMH), followed by optimizing both amplitude and phase of the original light field via an enhanced Gerchberg-Saxton algorithm. This enables filterless reconstruction of high-quality full-color 3D images from a single hologram, eliminating the need for three monochromatic holograms and bulky filtering systems required by conventional methods. In addition, our method significantly enhances the reconstruction quality of OMHs, elevating the peak signal-to-noise ratio (PSNR) from 12.81 dB to 38.66 dB while reducing background noise. Our work enables OAM holograms to reconstruct complex 3D images, expands the application range of OAM in holography, and provides a new route for the widespread application of holographic displays.