Simultaneous phase shifting interferometry based in a Mach Zehnder interferometer for measurement of transparent samples

A Mach Zehnder (MZ) interferometer was implemented to analyze a phase object using polarization phase-shifting interferometry. The Mach Zehnder interferometer produces two beams with circular polarization of opposite rotations one respect to the other. The system is coupled to a 4-f system with phase grating in the Fourier plane, interference of the fields associated with replicated beams centered on the diffraction orders is achieved by a proper choice of the beams spacing with respect to the gratings period. The optical configuration allows obtaining n-interferograms in one shot. The configuration presented does not require micro-polarizer arrays or additional software to eliminate noise caused by vibration, as the system is stable itself and uses conventional polarizing filters. Considering the object under study a thin phase object, experimental results are presented.

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