Holographic display based on partially coherent light

Computer holography is based on advanced computer technology and the basic principle of wave optics, and it is widely employed in many optical fields. In the holographic display, both display systems and encoding methods of computer-generated hologram have effects on the reconstructed image quality. The high coherence of light source causes laser speckle noise that degrades modulation quality severely. We propose a novel method to encoding computer-generated hologram, in which a partially temporal coherent light with a broadband continuous spectrum is used to illuminate the object image. We consider the partially temporal coherence of an actual light source and encode the computer-generated hologram based on the extended spectrum of the actual light source. This ensures that the design source is consistent with the reconstructed source. In this paper, we compare the reconstructed images from the proposed encoding method with that obtained from the encoding method based on ideal temporal coherent light. Under the same conditions the proposed method can obtain a more accurate and clear object image with the naked eyes. The proposed method can provide a reference for various wave-front modulations.

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