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Wave dislocation line threaded polarization interferometer
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DOI：10.1364/OL.448792.png)
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Abstract
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Constructing a closed-circuit polarization interferometer, wherein a wave dislocation line can be visualized to thread the parameter space, is a topic of fundamental and applied research interest. Proposed by Berry [Proc. R. Soc. A 463, 1697 (2007)] in the scalar wave domain, this universal phenomenon is simulated and experimentally demonstrated in the vector domain using a rotated-tilted quartz crystal plate in a polarization interferometer. The phase difference between overlapping ordinary and extraordinary paraxial ray beams passing through the crystal plate is varied continuously. The appearance of +/- 1 dislocation number spiraland saddle-type topological structures in the complex Stokes phase is a result of satisfying +/- pi/2 phase difference between the ray beams and around the zero-crossings of the Stokes parameters. (C) 2022 Optica Publishing Group