Fig. 1. (a1)–(a3) Phase distributions of the MHC beams. (b1)–(b3) Simulation of the spatial frequency distributions of the MHC beams. (c) Relationship between the TC and sampling constant d. (d) Principle of the MHC-OAM holography.

Fig. 2. MHC-OAM mode selectivity. (a) Mode selectivity of the constant K. (b) Mode selectivity of the multiramp mixed screw-edge dislocations. (c) Relationship between the reconstructed normalized peak intensity and normalized factor r0. (d) Interference field distribution of the encoded MHC beam with r0=1mm and decoded MHC beams with r0=0.8mm, r0=0.95mm, r0=1mm, and r0=1.5mm, respectively.

Fig. 3. (a) SNR as a function of the number of multiramp mixed screw-edge dislocations. (b) SNR as a function of the normalized factor.

Fig. 4. (a) Schematic diagram of the experimental setup of MHC-OAM holography. L1 and L2, lens; A, aperture; P, polarizer; BS, beam splitter; and SLM, spatial light modulator. (b) The hologram loaded into the SLM contains the decoded phase and OAM hologram.

Fig. 5. Schematic diagram of MHC-OAM-multiplexed holography designed with key m. (a) Design process. (b)–(e) Experimental reconstruction results based on the m-dependence of the incident MHC beams with m=4, 5, 6, and 7, respectively. (f) Reconstruction holographic image by a planar wave.

Fig. 6. Schematic diagram of MHC-OAM-multiplexed holography designed with key r0. (a) Design process. (b)–(e) Experimental reconstruction results based on the r0-dependence of the incident MHC beams with r0=0.5, 0.6, 0.7, and 0.8 mm, respectively.

Fig. 7. Experimental reconstruction results of the α-K-encrypted MHC-OAM multiplexed holography. (a) The design process and (b)–(e) experimental reconstruction results.

Fig. 8. The experimental reconstruction results of the m-K-encrypted MHC-OAM-multiplexed holography. (a) Design process and (b)–(e) experimental reconstruction results.

Fig. 9. Experimental reconstruction results of the r0-K-encrypted MHC-OAM-multiplexed holography. (a) Design process and (b)–(e) experimental reconstruction results.

Fig. 10. Experimental reconstruction results of the α-m-encrypted MHC-OAM-multiplexed holography. (a) Design process and (b)–(e) experimental reconstruction results.

Fig. 11. Experimental reconstruction results of the α-m-r0-K-encrypted MHC-OAM-multiplexed holography. (a) Design process and (b) experimental reconstruction results.

Fig. 12. Experimental reconstruction results of the α-m-K-encrypted MHC-OAM-multiplexed holography. (a) Design process and (b) experimental reconstruction results.

Fig. 13. The encrypted images are encoded by the parameters α, m, r0, and K.

Fig. 14. Experimental reconstruction results of the α-m-r0-K-encrypted MHC-OAM-multiplexed holography.