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Real-color hologram with wide viewing angle obtained by the combination of computer and optical method

A new technique is proposed to obtain a real color hologram with a large viewing angle by the combination of computer and optical method. Two steps are followed to finish this technique. (1) Computer-generated hologram H1 is yielded. According to the theory of light propagation, and taking full advantage of computer-generated hologram, object lightwave distribution of three monochromatic Fresnel holograms with a large dimension is computed in different area of the same plane. Object lightwave distribution is folded into smaller area based on the method of mirror images. High density holograms H1r, H1g, H1b are generated after the holograms are exported and microfilmed. (2) A rainbow hologram H2 is generated by optical ways. In the recording procedure, two parallel mirrors with appropriate parameters must be matched in the experiment system. In terms of the reversibility of light path principle, an image with a wide viewing angle is reconstructed by reversing the reconstruction lightwave. The principle of the proposed method and the experimental result prove that the technique achieves a color reconstructed image with a wide viewing angle of 14° . It is very clear that the stereoscopic effect of the reconstructed image is increased.