Phase conjugation of wavefronts containing phase singularities

I. G. Marienko; Marat S. Soskin; Mikhail V. Vasnetsov

doi:10.1117/12.317713

3 August 1998 Phase conjugation of wavefronts containing phase singularities

I. G. Marienko, Marat S. Soskin, Mikhail V. Vasnetsov

Proceedings Volume 3487, International Conference on Singular Optics; (1998) https://doi.org/10.1117/12.317713
Event: International Conference on Singular Optics, 1997, Partenit, Crimea, Ukraine

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.

Citation Download Citation

I. G. Marienko, Marat S. Soskin, and Mikhail V. Vasnetsov "Phase conjugation of wavefronts containing phase singularities", Proc. SPIE 3487, International Conference on Singular Optics, (3 August 1998); https://doi.org/10.1117/12.317713

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