Fig. 1. Schematic of multi-focal photon-sieve array

Fig. 2. Diffraction fields at focal plane f3=160 mm. (a) Normalized intensity distribution; (b) phase distribution

Fig. 3. Schematic of measuring light path of phase-shifting digital holography

Fig. 4. Four-step phase-shifting digital holograms with different phases of plane reference light. (a) θ=0; (b) θ=π/2; (c) θ=π; (d) θ=3π/2

Fig. 5. Experimental result of resolution board. (a) Auto-focusing curve; (b) reconstructed image

Fig. 6. Experimental results of three-step phase-shifting. (a) Hologram of θ=0; (b) hologram of θ=2π/3; (c) hologram of θ=4π/3; (d) auto-focusing curve; (e) reconstructed image

Fig. 7. Experimental results of two-step phase-shifting. (a) Hologram of θ=0; (b) hologram of θ=π/5; (c) auto-focusing curve; (d) reconstructed image