Superposed Laguerre-Gaussian Beams-Based Orbital Angular Momentum Holography

Orbital angular momentum (OAM) holography implements OAM of light as an information carrier to reconstruct holographic images, due to a physically unbounded set of orthogonal OAM modes. Here, superposed Laguerre-Gaussian (LG) beams are employed as incident beams to achieve OAM holography. Notably, this scheme utilizes exact complex-amplitude modulation, as opposed to mere phase-only modulation, ensuring the maintenance of amplitude information. In the absence of a matching field, the output images retain the properties of incident beams with a varying number of bright petals in each sampling pixel. On the other hand, when specific incident beams are illuminated, the output images can be reconstructed with multiple matching fields that lead to different intensities. It is essential to recognize that the bright spot in each sampling pixel of the output image achieves its peak intensity only when the matching field is the conjugate of the incident light field. This work offers a novel perspective on reconstructing holographic images through various matching fields and modulating the brightness of distinct holographic images in OAM-multiplexing holography. Additionally, a theoretically infinite number of bright petals in each sampling pixel can also serve as information carriers in holography. Superposed Laguerre-Gaussian beams-based orbital angular momentum holography is demonstrated theoretically and experimentally. In the absence of a matching field, the output images retain the properties of incident beams with a varying number of bright petals in each sampling pixel. Further, the output images can be reconstructed with multiple matching fields that lead to different intensities.image