Abstract
This paper presents a two-shot common-path phase-shifting interferometer that consists of a optical system with two windows in the input plane and a Ronchi grating in the Fourier plane, and generates two adjacent interferograms using only diffraction orders 0 and and 0 and . Four phase-shifted interferograms can be obtained in two shots by modulating two linear polarizers with angle difference of and translating the grating with only an unknown phase shift. An algorithm similar to the standard four-step algorithm is used to retrieve the phase of a specimen, and it requires no knowledge of the phase shift introduced by translation of the grating. The validity and repeatability of the proposed method is proved through simulations and experiments.
© 2014 Optical Society of America
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