Abstract

A dynamic Mach–Zehnder interferometer based on lateral displacement of a point source array is proposed. The point source array is generated by a point source and a phase grating, where four point sources are of identical intensity. The lateral displacement of each point source can be adjusted to introduce π/2 phase steps in the interferograms. With a specially designed lens array in the spatial split imaging system, four separated and clear imaging interferograms can be captured in a single shot. Using a four-bucket algorithm, the phase distribution can be retrieved exactly, thereby realizing dynamic measurement. The experimental results show the feasibility and high precision of this dynamic Mach–Zehnder interferometer.

© 2018 Optical Society of America

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Supplementary Material (1)

NameDescription
» Visualization 1       Dynamic process of the gas flow. The simultaneous phase-shifting interferograms with gas flow in the cavity are detected by a 1200×1200 pixel CCD every 100 millisecond, and then the phase is retrieved.

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