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Proceedings Paper

Phase conjugation of wavefronts containing phase singularities
Author(s): I. G. Marienko; Marat S. Soskin; Mikhail V. Vasnetsov
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Paper Abstract

Optical Vortex (OV), or wavefront screw dislocation represents a wavefront phase defect, where the wavefront attains a helicoidal shape. The wave possessing axial OV is one of the possible solutions of scalar wave equation. It means the expression for OV has in the simplest case a form E(r,(phi) ) varies direct as rexp(i(phi) ), where r, (phi) are cylindrical coordinates. Therefore OV is a discontinuity of the phase such that the phase circulation around its axes is an integral multiple of 2(pi) . The phase change for circulation around the axis may have different signs. It determines the topological sign of screw dislocation and correspondingly the helicoidal form of dislocation: with right twirl (positive) or left twirl (negative). Moreover, in a general case a wavefront around vortex axis may have a form of multistart helicoid, with a pitch m(lambda) , when (lambda) is the wavelength, and m is integer. The objective of this paper is to present experimental reversal of screw dislocation by four-wave mixing and to investigate the sign of dislocation within phase- conjugated beam with respect to the incident signal beam.

Paper Details

Date Published: 3 August 1998
PDF: 3 pages
Proc. SPIE 3487, International Conference on Singular Optics, (3 August 1998); doi: 10.1117/12.317713
Show Author Affiliations
I. G. Marienko, Institute of Physics (Ukraine)
Marat S. Soskin, Institute of Physics (Ukraine)
Mikhail V. Vasnetsov, Institute of Physics (Ukraine)

Published in SPIE Proceedings Vol. 3487:
International Conference on Singular Optics
Marat S. Soskin, Editor(s)

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