A small field of view is one of the main limitations of holographic displays that prevent holographic displays from being successful commercial products. Although several methods have been proposed and shown some abilities to extend the replay field, they either introduce high-cost components or have complex experimental setups. In this paper, we propose a new method to extend the field of view of holographic display systems. The proposed method is based on an off-axis holographic display with two laser beams and one SLM. The SLM is illuminated by two laser beams from different angles and the holograms displayed are synchronized with alternating laser beams. Experimental results demonstrate that the proposed method can extend the replay field by two times with high-quality image reconstruction, less cost and simple experimental setups.
Despite many years of development in computer-generated holography, perfect phase-only holograms for most target images are still yet possible to compute. All computational phase retrieval algorithms end up with some error between the target image and the reconstruction of the computer-generated hologram (CGH), except for specific targets. This research focuses on the fundamental limits of phase-only CGH quantized to limited bit-depth levels, from the information theory point of view, revealing the information capacity of CGH and its effect on reconstruction quality, with an attempt to quantify how hard a target image is for phase-only hologram computation.
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