Wide Angle Phase only Computer Generated Hologram by Angular Spectrum Compact Space Bandwidth product method

Abstract

Wide-angle capability is critical for holographic near-eye displays. Since most systems employ phase-only spatial light modulators (SLMs), computer-generated holograms (CGHs) must be encoded as phase-only holograms (PoHs). This work presents two approaches for PoH-based CGH generation from plane images: a direct single-step method (D-PoH) and an iterative method (I-PoH). Both utilize the Compact Space-Bandwidth Angular Spectrum (CSW-AS) technique for propagation, which is optimal for wide-angle scenarios. We evaluate their accuracy and zero-padding requirements. Results show that I-PoH provides a higher quality image, but at the cost of cyclic computations and the requirement of substantially larger zero-padding compared to D-PoH, limiting its efficiency for wide-angle applications. In contrast, I-PoH achieves a maximum field of view (FoV) of 39°, while D-PoH enables a significantly larger FoV of 54°, for a PC with 64GB RAM. These findings demonstrate the advantage of direct single-step encoding for achieving wide-angle holographic displays.

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