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Opt Express. 2008 May 26;16(11):7806-17.

One-shot phase-shifting phase-grating interferometry with modulation of polarization: case of four interferograms.

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Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Físico-Matemáticas Apartado Postal 1152, Puebla PUE 72000, México.


An experimental setup for optical phase extraction from 2-D interferograms using a one-shot phase-shifting technique able to achieve four interferograms with 90 degrees phase shifts in between is presented. The system uses a common-path interferometer consisting of two windows in the input plane and a phase grating in Fourier plane as its pupil. Each window has a birefringent wave plate attached in order to achieve nearly circular polarization of opposite rotations one respect to the other after being illuminated with a 45 degrees linear polarized beam. In the output, interference of the fields associated with replicated windows (diffraction orders) is achieved by a proper choice of the windows spacing with respect to the grating period. The phase shifts to achieve four interferograms simultaneously to perform phase-shifting interferometry can be obtained by placing linear polarizers on each diffraction orders before detection at an appropriate angle. Some experimental results are shown.

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