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.
Lina Zhu(朱丽娜), Fei Li(李飞), Zeyu Huang(黄泽宇), and Tingyu Zhao(赵廷玉) An apodized cubic phase mask used in a wavefront coding system to extend the depth of field 2022 Chin. Phys. B 31 054217
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