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Opt Express. 2013 Jan 28;21(2):2126-32. doi: 10.1364/OE.21.002126.

Parallel two-step spatial carrier phase-shifting common-path interferometer with a Ronchi grating outside the Fourier plane.

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  • 1College of Information and Communication Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China.

Abstract

A parallel two-step spatial carrier phase-shifting common-path interferometer with a Ronchi grating placed outside the Fourier plane is proposed in this paper for quantitative phase imaging. Two phase-shifted interferograms with spatial carrier can be captured simultaneously using the proposed interferometer. The dc term can be eliminated by subtracting the two phase-shifted interferograms, and the phase of a specimen can be reconstructed through Fourier transform. The validity and stability of the interferometer proposed are experimentally demonstrated via the measurement of a phase plate.

PMID:
23389193
[PubMed - indexed for MEDLINE]
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