One-shot phase-visibility modulating interferometry by on–off non-quadrature amplitude modulation

•Single shot phase and visibility modulation interferometry with multiple interferograms at the image plane.•Three beams 4f common path optical interferometer with a Ronchi ruling at the Fourier plane.•On–off non-quadrature amplitude modulation generated by the grating's fill factor.•With this method it is possible to retrieve successfully the phase of the object under test.

This manuscript presents a proposal for achieving in a single-shot the phase-visibility modulating interferometry method. The setup is based on a 4f optical system consisting of three apertures at the input plane and a grid with a fill factor of 1/2 at the Fourier plane. One of the apertures serves as a probe beam and the other two apertures serve as reference beams, with which a reference beam modulated in phase and amplitude by the on–off non-quadrature amplitude modulation method is created. We show that the grid implements simultaneously the on–off non-quadrature amplitude modulation technique; therefore multiple interferograms can be obtained in a single-shot. A theoretical model will be shown supported by the experimental results.