Iterative algorithms for off-axis double-phase computer-generated holograms implemented with phase-only spatial light...

Area of Science:

• Optics and Photonics
• Digital Holography
• Wavefront Reconstruction

Background:

• Traditional methods for calculating double-phase holograms (DPHs) have limitations in the size of the reconstructed wavefront format.
• Previous techniques typically reconstructed wavefronts up to approximately 35% of the spatial size of a reconstruction order.

Purpose of the Study:

• To introduce and describe two novel iterative methods for calculating double-phase holograms (DPHs).
• To enhance the capability of DPHs for wavefront reconstruction in terms of format size and diffraction orders.

Main Methods:

• Development and application of two iterative algorithms for DPH computation.
• Numerical simulations and optical experiments to validate the proposed methods.

Main Results:

• The new methods allow qualitative reconstruction of wavefront amplitude and phase up to 50% of the spatial size of a reconstruction order.
• Reconstruction is demonstrated not only into the conventional 0, +1, or -1 orders but also into half-orders (+1/2, -1/2).
• Discussion on the diffraction efficiency of phase-only DPHs.

Conclusions:

• The presented iterative methods significantly expand the achievable reconstruction format size for DPHs.
• The ability to reconstruct into half-orders offers new possibilities in holographic applications.
• The findings are supported by both numerical and experimental evidence.