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A phase-shifting electronic speckle pattern shearing interferometer with a very simple shearing device is proposed. Two partially reflective glass plates are used to introduce the shear in this new interferometer. The reflection coefficients of the coatings on the two plates are 0.3 and 0.7. The distance between the two glass plates controls the size of the shear. The proposed new interferometric system is simple, flexible, and low cost.
Mihaylova, E., Whelan, M., Toal, V.: A Simple Phase-Shifting Lateral Shearing Interferometer. Optics Letters, 29 (11), 1264, June, 2004.