Creation of a single optical vortex in the vicinity of a double caustic cusp by light focused by a two-component crystal-optics element

V. Yu. Osipov; A. A. Buznikov

doi:10.1117/12.852261

31 December 2009 Creation of a single optical vortex in the vicinity of a double caustic cusp by light focused by a two-component crystal-optics element

V. Yu. Osipov, A. A. Buznikov

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Proceedings Volume 7388, Ninth International Conference on Correlation Optics; 73880B (2009) https://doi.org/10.1117/12.852261
Event: Correlation Optics 2009, 2009, Chernivsti, Ukraine

Abstract

In the neighborhood of the cusp of the "double" caustic produced by the y- polarized components of the convergent eoand ee- beams, a single isolated optical vortex of a limited extent along the z axis was found to exist. The validity of this observation is argued for by the well pronounced, deep gap in intensity at the center of the vortex, along its longitudinal axis, and by a spiral-shaped interference pattern formed as the wave field of the vortex under study becomes superimposed on the reference plane wave. Preliminary experiments suggest that this structure disappears rapidly (collapses) already at a slight change of the inclination of the laser beam striking the two-component crystal-optics element (TCE), thus showing it to depend critically on the type of the aberrations introduced into the beams undergoing focusing, while persisting qualitatively on small spatial scales in the z direction. The morphology of this vortex structure depends critically also on the precision (or angular tolerances) of mutual orientation of the optical axes in the components, and of the vectors of the normals to the entrance and exit TCE faces with which the lens parts are cut out from the original calcite crystal and cemented subsequently after the desired matching has been reached. The observed single vortices are formed only under four mutually symmetric and strictly defined angular orientations of the incident collimated light beam relative to the entrance face of TCE.

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V. Yu. Osipov and A. A. Buznikov "Creation of a single optical vortex in the vicinity of a double caustic cusp by light focused by a two-component crystal-optics element", Proc. SPIE 7388, Ninth International Conference on Correlation Optics, 73880B (31 December 2009); https://doi.org/10.1117/12.852261

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KEYWORDS

Optical vortices

Crystals

Diffraction

Collimation

Optical components

Polarizers

Laser crystals

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