Speckle-reduced reconstruction of a single-shot hologram by multiple tip-tilt modulations

被引：1
作者：
Yang, Feng [1 ,2 ,3 ]
Zhu, Lei [2 ,3 ]
Wei, Kai [2 ,3 ]
Zhang, Yudong [2 ,3 ]
Cao, Liangcai [1 ]
机构：
[1] Tsinghua Univ, Dept Precis Instruments, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China
[2] Chinese Acad Sci, Key Lab Adapt Opt, Chengdu 610209, Sichuan, Peoples R China
[3] Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Sichuan, Peoples R China
来源：
APPLIED OPTICS | 2021年 / 60卷 / 17期
基金：
中国国家自然科学基金;
关键词：
COHERENT NOISE-REDUCTION; DIGITAL HOLOGRAPHY; NONLOCAL MEANS; MICROSCOPY; FRINGES;
D O I：
10.1364/AO.426329
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Speckle can be attenuated by averaging the reconstructed images of each sub-hologram or being filtered with different filters, at the expense of resolution. We propose a de-speckling method for a single-shot digital hologram while maintaining the resolution. Different tip-tilt phases are demonstrated to cause changes only for the speckle distributions of the reconstructed image. The speckle is attenuated by averaging these intensity images with different speckle distributions. The normalized contrast can be reduced to 0.56 by averaging only 20 different reconstructed images. When the averaged image is processed with block matching and 3D filtering, a further de-speckled image at a normalized contrast of 0.46 can be obtained with highly preserved resolution. (C) 2021 Optical Society of America
引用
收藏
页码：5220 / 5226
页数：7
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