Fig. 3: Two types of interference in OAM reconstructed images.

a OAM beams with the helical mode index l = 1 is incident on the OAM-multiplexed hologram, and images carried by different OAM channels are displayed simultaneously (left). In the coherent case (top right), these coherently superposed images have the interference of different OAM modes at all pixels. In the pseudo incoherent case (bottom right), these images are superposed by the intensity and demonstrate no interference. b Three representative pixels from the reconstructed image in a, for the coherent (left) and pseudo incoherent (right) cases. Intensity distributions are presented in both 2D profiles and 1D cross-sectional views where the values indicate the normalized intensity integral within the region as denoted by vertical dotted lines. c Intensities of all pixels in the post-processed results of the reconstructed image in a.