The multi-mode Bessel-Gaussian beams OAM holographic method

In this paper, We prepare a multi-mode Bessel Gaussian (MBG) selective hologram by stacking different mode combinations of Bessel-Gaussian phases on a multi-mode Bessel-Gaussian saved hologram in stages. Using a multi-mode BG beam with opposite combination parameters to illuminate the MBG-OAM hologram, the target image can be reconstructed after Fourier transform, and the sampling constant of this scheme is flexible and controllable. The encoding of holograms includes multiple BG mode combination parameters. When decoding incident light, the corresponding mode combination parameters must be met in order to reconstruct the image. This can effectively improve the security of OAM holography and the number of multiplexing channels.