Formation of a quadrupole vortex and a second-order optical vortex in caustics upon focusing of light by a two-component crystal-optics element |
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| Authors: | V. Yu. Osipov and A. A. Buznikov |
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| Affiliation: | (1) Department of Astronomy, University of Padova, vicolo dell’Osservatorio 3, 35122 Padova, Italy;(2) INAF—Astronomical Observatory of Capodimonte, salita Moiariello 16, 80131 Naples, Italy;(3) TASC National Laboratory, Area Science Park, 34012 Basovizza, Italy;(4) Department of Physics, University of Padova, via Marzolo 8, 35131 Padova, Italy;(5) CNR/INFM Laboratory for Ultraviolet and X-ray Optical Research and Department of Information Engineering, University of Padova, via Gradenigo 6/b, 35131 Padova, Italy |
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| Abstract: | A wave field of a structurally stable diffraction caustic that is formed upon focusing of a collimated laser beam with the help of a two-component crystal-optics element consisting of uniaxial crystals is characterized by a crystal-like cellular structure. Near the cusp of this caustic (diffraction catastrophe), a well-pronounced localized quadrupole optical vortex is observed that consists of four isolated vortices with pairwise opposite topological charges of −1, +1, +1, and −1. The creation and annihilation points of this combined quadrupole vortex are determined. Upon reversal of the direction of propagation of the laser beam through the crystal-optics element, the caustic in the focal region has already become a binary combination and inhomogeneously polarized, and a second-order optical vortex is observed near the cusp of this caustic. |
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