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V. SLAVCHEV1,2,* , A. DAKOVA2,3, I. BOJIKOLIEV2, D. DAKOVA3, L. KOVACHEVb2
- Department of Medical Physics and Biophysics, Medical University -Plovdiv, Bul. VasilAprilov 15-А, 4002 Plovdiv, Bulgaria
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradckoshossee, 1784 Sofia, Bulgaria
- Physicsand Technology Faculty, University of Plovdiv “PaisiiHilendarski”, 24 Tsar Asen Str., 4000 Plovdiv, Bulgaria
The optical vortices are usually created outside the laser cavity using different optical masks and holograms. The vortex structures are characterized by helical phase fronts. Their solutions are governed by the 2D Leontovich scalar equationand admit amplitude and phase singularities.In present work we investigated theformation of vector vortex structuresofoptical pulses,propagatingin concave and convex gradient optical fibers in nonlinear regime. The corresponding vector system of amplitude equationsis solved analytically and new class analytical solutions, describing the generation of vector field vortices insuch gradient opticalfibersarefound.These new vector vortices admit amplitude typesingularities, but not phase ones. Experimentally, this will look like as a special kind of depolarization of the vector field in the spot diamete.
Optical vortex structures, Vector spatio-temporal amplitude equations, Gradient fibers.
Submitted at: May 19, 2020
Accepted at: Oct. 22, 2020
V. SLAVCHEV, A. DAKOVA, I. BOJIKOLIEV, D. DAKOVA, L. KOVACHEVb, Generation of vector type vortices in gradient fiber with spatial dependence of the refractive index, Journal of Optoelectronics and Advanced Materials Vol. 22, Iss. 9-10, pp. 445-451 (2020)
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