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.
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 computergenerated hologram have effects on the reconstructed image quality. The high coherence of light source causes laser speckle noise that degrades modulation quality severely. The partially temporal coherent light (PTCL) has been applied to holographic reconstruction to reduce speckle noise in display systems, while the encoding methods of computergenerated hologram (CGH) based on PTCL have not been reported. We propose a novel method to encoding CGH, in which a PTCL with a broadband continuous spectrum is used to illuminate the object image.
The liquid crystal spatial light modulator (LC-SLM) is able to provide flexible wave front control, whereas its phase response distortions will influence the modulation accuracy. In this paper, we will provide a novel sub-regional phase response calibration method for minimizing these distortions. In our calibration method, the entire panel is divided into several local regions based on the similarity of phase response characteristic. Liquid crystal cells in one sub-region show the same phase response. The calibration method is theoretical analyzed and experimentally verified. For the entire Jasper 4K SLM panel, when three local regions are built, the root mean error of linear phase shifts is reduced to approximate 0.1 rad. The calibrated SLM is applied for holographic display and the structural similarity index of the assessment shows the improvement ratios reach 30.6%, 62.5%, and 43.6% for R, G, and B reconstructed components respectively. It also could be used for the calibration of various SLMs in the future.
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