Fig. 1. Fresnel diffraction results of free lens phase

Fig. 2. Relationship between sampling constant and $r_{\mathrm{0}}$

Fig. 3. Design flow of OAM multiplexed holography based on free lens phase

Fig. 4. Experimental setup

Fig. 5. The result of the inner product of the independent parameters in the phase of the free lens

Fig. 6. Mode selectivity of independent parameters $f$ and $r_{\mathrm{0}}$ in orbital angular momentum holography

Fig. 7. Mode selectivity of the parameter $q$

Fig. 8. Flow of f and $r_{\mathrm{0}}$ jointly encoding OAM holography and reconstruction results

Fig. 9. Multi-parameter joint coding phase and its reconstructed results

Fig. 10. Fractional order topological charge holographic multiplexing scheme