Parallel common path phase-shifting interferometer with a digital reflective grating

Bai, Hongyi; Shan, Mingguang; Zhong, Zhi; Guo, Lili; Zhang, Yabin

doi:10.1117/12.2211285

Cited by 2 publications

(1 citation statement)

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“…Of course, two exposures are required in our method. It is, therefore, suggested to use a digital RG in further study, such as employing a digital micromirror device with the capability of modulating the amplitude and switching binary images at tens of kHz rate, to improve the shifting speed and make the method suitable for the measurement of moving objects or dynamic processes [35][36][37]. Furthermore, we also measured the plano-convex cylinder lens using carrier holograms with a different phase shift.…”

Section: Resultsmentioning

confidence: 99%

Slightly off-axis flipping digital holography using a reflective grating

Bai

Min

Yang

et al. 2020

J. Opt.

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A slightly off-axis digital holography is proposed using the flipping interferometry with a reflective grating to obtain the quantitative phase distribution. The setup is established based on a modified 4f optical system using an improved flipping module with a reflective grating and a retro-reflector made of a two-mirror construction. The input plane of the system is divided into two windows: one for object beam and the other for reference beam. Employing the flipping module, the interference patterns can be obtained by flipping the images of the object and reference beams. By translating the +1 diffraction order of the reflective grating, two carrier holograms with a phase shift between them can be obtained in two exposures. The reconstructed quantitative phase distribution of a specimen can be acquired with a simple slightly off-axis retrieval method aided by specimen-free holograms. Many measurements on both thick and thin phase specimens are performed to prove the validity of our method.

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Section: Resultsmentioning

confidence: 99%