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Detection of Vortex Sign for Scalar Speckle FieldsKeywords: vortex , shift-interferometry , interference forklets , topological charge Abstract: A technique is described for determining vortex sign in the scalar optical fields (including statistical ones) under conditions when it is impossible to use a regular reference beam. The elaborated approach is based on the shift-interferometry technique. The optimal conditions for identifying the vortices are formulated. The results of computer simulations and the corresponding experimental confirmation of our theoretical findings are presented.
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