Spatial phase shifting algorithm in digital holographic microscopy with aberration: More than the speed concern. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Yi; Zhong, LiYun; Lu, XiaoXu; Chen, Qiujia; Zhou, Chengxin; Qin, Yuwen
• Is Part Of: Optics and lasers in engineering. Volume 158(2022)
• Publication Date: 2022-11
• Subjects: Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2022.107169
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: 1 A spatially local algorithm is proposed to adapt the phase demodulation of off-axis interferograms to the instable spatial carrier induced by the aberration phase. 2 Meanwhile, the proposed algorithm can estimate the curvature of aberration phase and remove it. 3 The application of the proposed algorithm in several different interferometric configurations is discussed. Abstract: Accurate aberration phase compensation is significant for high spatial phase sensitivity in digital holographic microscopy (DHM). The model widely used in state-of-the-art methods regards the aberration phase as an additional and independent phase term and we just need to subtract it out. However, owing to the instable phase carrier induced by this additional phase term, the phase demodulation procedure will suffer from a non-additive phase distortion which cannot be directly subtracted out by digital post-processing. Consequently, it is necessary to remove this aberration phase and suppress the non-additive distortion at the same time. In this work, we propose a modified spatial phase shifting (MSPS) algorithm by making the phase demodulation procedure be adaptable to the interferogram with instable spatial carrier. Using such MSPS algorithm, the aberration phase can be automatically estimated before 2D unwrapping and the non-additive phase distortion can be effectively suppressed at the same time.