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Proceedings Paper

Branching probe beams by fractional vortex dipoles: guiding vs. anti-guiding
Author(s): G. Maleshkov; P. Hansinger; N. Dimitrov; A. Dreischuh; G. G. Paulus
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Paper Abstract

In this work we study the evolution and interaction of semi-infinite dark beams carrying edge-screw phase dislocations in self-focusing and self-defocusing local Kerr nonlinear media aiming to find appropriate conditions to control the process of fusion/crossing the dark beams in a way suitable for probe-beam cross-switching. We show that a quasi-infinite vortex dipole (dipole much longer than the background beam) evolves into a one-dimensional dark spatial soliton with vanishing transverse velocity. Single semi-infinite fractional dipole develops snake instability near the dark beam end. Depending on their phase profiles, four parallel semi-infinite fractional vortex dipoles aligned to initially form two dark stripes can evolve into two different ‘cross-connects’ able to branch and route probe optical beams. Perpendicular probe beam propagation in the optically-induced guiding structures is modeled and analyzed with respect to the branching efficiency to respective virtual output channels for both self-focusing and self-defocusing conditions.

Paper Details

Date Published: 15 March 2013
PDF: 8 pages
Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87701K (15 March 2013); doi: 10.1117/12.2016385
Show Author Affiliations
G. Maleshkov, Sofia Univ. (Bulgaria)
P. Hansinger, Friedrich-Schiller-Univ. Jena (Germany)
N. Dimitrov, Sofia Univ. (Bulgaria)
A. Dreischuh, Sofia Univ. (Bulgaria)
G. G. Paulus, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 8770:
17th International School on Quantum Electronics: Laser Physics and Applications
Tanja N. Dreischuh; Albena T. Daskalova, Editor(s)

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