  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.
