Ultra‐Robust Data Storage and Encryption via Spatial Coherence Encoded Laguerre–Gaussian Mode Multiplexing Holography

ABSTRACT Orbital angular momentum (OAM) holography has promising applications in high‐density data storage, optical information multiplexing/encryption, and optical display. Conventional OAM‐based holographic techniques exhibit inherent limitations in multiplexing applications, including inter‐channel crosstalk and information degradation. In this study, we incorporate spatial coherence, an inherent degree of freedom in light fields, into the design of OAM multiplexing holography, which can significantly improve the grayscale fidelity and density for holographic storage while maintaining the high resolution and low multiplexing crosstalk of reconstructed images. In the experiment, we utilize Laguerre‐Gaussian modes with radial index p and azimuthal index l as decoding channels for various holographic multiplexing, thereby further enhancing the information storage capacity. Benefiting from the self‐healing ability of light fields with partial spatial coherence, the quality of holographic images is immune to the loss of partial information in holograms, even under environmental perturbations. Our work provides a unique perspective for the OAM multiplexing holography design and the reconstruction of holographic images, with varied applications in high‐security optical encryption and ultra‐robust information transmission in complex environments.