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Shearing interferometry via geometric phase
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DOI：10.1364/OPTICA.6.000396.png)
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Abstract
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We propose an approach based on geometric phase for performing several types of shearing interferometry through a robust, compact, common-path setup. The key elements are two identical parallel plates with spatially varying birefringence distributions, which perform the shearing by writing opposite geometric phases on the two circular polarization components of the linearly polarized incident wavefront. This setup allows the independent control of the shearing magnitude and relative phase of the two wavefront replicas. The approach is first illustrated for the simplest case of lateral shearing, and then extended to other geometries where the magnitude and direction of the shear vary smoothly over the wavefront. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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