中国物理B ›› 2022, Vol. 31 ›› Issue (5): 54217-054217.doi: 10.1088/1674-1056/ac5979

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An apodized cubic phase mask used in a wavefront coding system to extend the depth of field

Lina Zhu(朱丽娜), Fei Li(李飞), Zeyu Huang(黄泽宇), and Tingyu Zhao(赵廷玉)   

  1. Department of Physics, Key Laboratory of Optical Field Manipulation of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • 收稿日期:2021-10-28 修回日期:2022-02-10 出版日期:2022-05-14 发布日期:2022-04-21
  • 通讯作者: Tingyu Zhao,E-mail:zhaotingyu@zstu.edu.cn E-mail:zhaotingyu@zstu.edu.cn

An apodized cubic phase mask used in a wavefront coding system to extend the depth of field

Lina Zhu(朱丽娜), Fei Li(李飞), Zeyu Huang(黄泽宇), and Tingyu Zhao(赵廷玉)†   

  1. Department of Physics, Key Laboratory of Optical Field Manipulation of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • Received:2021-10-28 Revised:2022-02-10 Online:2022-05-14 Published:2022-04-21
  • Contact: Tingyu Zhao,E-mail:zhaotingyu@zstu.edu.cn E-mail:zhaotingyu@zstu.edu.cn
  • About author:2022-3-2

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摘要： The point spread function (PSF) caused by a wavefront coding system with a cubic phase mask has big side-lobes which leads to bad image restoration. This paper proposes a novel apodized cubic phase mask to suppress the side-lobes of the PSF. Simulated annealing algorithm is used to optimize the cubic and the truncation parameter of the phase mask. The system with the novel phase mask has better performance in the modulation transfer function (MTF) especially in low-and-medium spatial frequency region. The simulation results show that the restored images with the novel phase mask are superior to the one with the classic cubic phase mask in contrast and ringing effect. The experimental results show that the side-lobes of the PSF are suppressed by using the apodized cubic phase mask.

关键词: apodized cubic phase mask, wavefront coding, depth of field, image restoration

Abstract: The point spread function (PSF) caused by a wavefront coding system with a cubic phase mask has big side-lobes which leads to bad image restoration. This paper proposes a novel apodized cubic phase mask to suppress the side-lobes of the PSF. Simulated annealing algorithm is used to optimize the cubic and the truncation parameter of the phase mask. The system with the novel phase mask has better performance in the modulation transfer function (MTF) especially in low-and-medium spatial frequency region. The simulation results show that the restored images with the novel phase mask are superior to the one with the classic cubic phase mask in contrast and ringing effect. The experimental results show that the side-lobes of the PSF are suppressed by using the apodized cubic phase mask.

Key words: apodized cubic phase mask, wavefront coding, depth of field, image restoration

中图分类号:  (Imaging and optical processing)

  • 42.30.-d
42.30.Kq (Fourier optics) 42.30.Lr (Modulation and optical transfer functions) 42.30.Va (Image forming and processing)