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Abstract We developed an interferometric system capable of generate four interferograms simultaneously with independent phase shifts employing modulation by polarization. The proposed system consists of three coupled interferometers: A polarized Mach–Zehnder interferometer (PMZI) which generates a primary pattern with crossed polarizations, coupled to two Michelson systems that serve as replicators of the primary pattern. In the proposed system, coupled three interferometers which generate four interference patterns with π /2 phase shifts. The four interference patterns can be detected simultaneously carrying a controllable phase shift by placing a linear polarizer in each replica obtained. To show the novelty and usage of the developed system on phase varying information temporal stability is presented and experimental results for static and dynamic variations. Highlights • Simultaneous phase shifting interferometry. • Experimental analysis of dynamic fast processes. • Coupled interferometers. [ABSTRACT FROM AUTHOR]

Abstract: In this paper, we propose a quasi common-path interferometer based on a two beams configuration (TBC) using simultaneous phase shifting interferometry modulated by polarization that shows insensitivity against external vibration. Due to the fact that the configuration is capable of obtaining two beams whose separation can be varied, according to the characteristics of the grid used, to obtain the interference patterns. It can be used to implement a quasi-common path interferometer that allows the measurement of dynamic events with high accuracy. For demodulate the fringe patterns generated by the optical system we using the conventional four step phase shifting method. Experimental results are also given. [Copyright &y& Elsevier]

This communication describes some details of polarization modulation that are useful in phase-shifting interferometry when applied to phase profile measurements of phase objects. Since non-destructive optical techniques allow surface measurement with high accuracy, a Mach-Zehnder configuration coupled to a 4-f arrangement using phase gratings placed on the Fourier plane was implemented to analyze phase objects. Each beam of the interferometer goes through a birefringent wave plate in order to achieve nearly circular polarization of opposite rotations, with respect to each other. The interference of the fields associated with replicated beams, centered on each diffraction order, is achieved varying the spacing of windows with respect to the grating period. Experimental results are presented for cases of four and nine simultaneously captured interferograms. [ABSTRACT FROM AUTHOR]

An interferometric method to measure the radial slope of dynamic transparent samples is presented. We have implemented a simultaneous phase shifting Mach–Zehnder radial-shear interferometer (SPS-MZRI) using a phase grating to replicate the interference patterns and phase shifts modulated by polarization; the interferometer is capable of processing the optical phase data through the acquisition of n-interferograms captured simultaneously. The SPS-MZRI is capable of obtaining the radial phase derivative and associating it with its corresponding radial slope. The experimental results for static and dynamic samples are presented in this work, as well as the experimental evidence for the generation of spiral patterns. [ABSTRACT FROM AUTHOR]