Encoding method for computer-generated hologram based on curve descriptions

Chunqi Li; Qita Huang; Jianfeng Ren

doi:10.1117/12.2689130

31 July 2023 Encoding method for computer-generated hologram based on curve descriptions

Chunqi Li, Qita Huang, Jianfeng Ren

Proceedings Volume 12747, Third International Conference on Optics and Image Processing (ICOIP 2023); 127471F (2023) https://doi.org/10.1117/12.2689130
Event: Third International Conference on Optics and Image Processing (ICOIP 2023), 2023, Hangzhou, China

Abstract

Computer-Generated Hologram (CGH) can be used to detect aspheric surface with high accuracy. In order to improve the encoding efficiency of CGH, this paper proposes an encoding method to describe the engraved fringes in segments using the arc as the primitive. Firstly, the phase contour boundary is obtained, and then the boundary is discretized by Newton iteration method. Finally, the discrete points are encoded with the circular arc as the primitive based on the minimum rms criterion of residual error, and the engraved fringes are obtained. In this paper, the CGH is designed, encoded and fabricated for an aspheric surface. The encoding file is only 7M under the premise of encoding accuracy better than λ /100 rms, which proves that this method can greatly improve the encoding efficiency compared with linear encoding. Finally, all errors of CGH are analyzed and summarized, and the root-mean-square error of all errors was 0.00283λ ,which proves the feasibility of the encoding method in this paper.

Citation Download Citation

Chunqi Li, Qita Huang, and Jianfeng Ren "Encoding method for computer-generated hologram based on curve descriptions", Proc. SPIE 12747, Third International Conference on Optics and Image Processing (ICOIP 2023), 127471F (31 July 2023); https://doi.org/10.1117/12.2689130

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