Diffraction grating three-beam interferometry without self-imaging regime contrast modulations

Optics Letters
Krzysztof PatorskiKrzysztof Pokorski

Abstract

Achromatic grating shearing interferometry method for wave front sensing is developed. Two Fresnel diffraction patterns formed by grating three lowest diffraction orders are recorded. The beam-splitter grating is displaced laterally by half its period between exposures. Calculating the sum of two patterns results in a two-beam interferogram free of inherent light propagation direction and observation plane contrast modulations imposed by the self-imaging phenomenon (Talbot effect). Single-frame automatic fringe pattern processing provides the interferogram phase distribution. The technique enables continuous shear variations suitable for dynamic range sensing. Experimental works corroborate enhanced capabilities of the proposed approach.

Citations

May 4, 2016·Applied Optics·Jianpei XiaJianping Ding
Mar 10, 2018·Optics Express·Krzysztof PatorskiKrzysztof Pokorski
Nov 25, 2018·Optics Express·Krzysztof PatorskiMaciej Trusiak
Apr 1, 2020·Optics Express·Krzysztof PatorskiMaciej Trusiak
Aug 31, 2021·Biomedical Optics Express·Piotr ZdańkowskiMaciej Trusiak

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