Fractional-order elliptic perfect optical vortex multiplexed holography

Orbital angular momentum (OAM) is implemented as an independent information channel in multiplexed holography. Vortex beams carrying OAM are characterized by helical wavefront. By theoretically infinite orthogonal modes, OAM can be used as an additional degree of freedom (DOF) to increase the information capacity of holography. However, the helical phase pattern can be encoded into only one hologram, that is, a topological charge (TC) channel can be associated with only one target image, which limits the multiplexing capability of OAM holography. In this paper, elliptic perfect optical vortex multiplexed holography with fractional-order TC is proposed. The modulated parameters of FEPOV, namely TC, ellipticity, and gap number, can be used as independent DOFs to encode and decode holograms. Using these three parameters as encryption keys, single-parameter and multi-parameter encrypted holograms are designed to enhance information capacity and security. The method demonstrates great potential in the field of information storage and encryption.