Branching probe beams by fractional vortex dipoles: guiding vs. anti-guiding

G. Maleshkov; P. Hansinger; N. Dimitrov; A. Dreischuh; G. G. Paulus

doi:10.1117/12.2016385

15 March 2013 Branching probe beams by fractional vortex dipoles: guiding vs. anti-guiding

G. Maleshkov, P. Hansinger, N. Dimitrov, A. Dreischuh, G. G. Paulus

Proceedings Volume 8770, 17th International School on Quantum Electronics: Laser Physics and Applications; 87701K (2013) https://doi.org/10.1117/12.2016385
Event: Seventeenth International School on Quantum Electronics: Laser Physics and Applications, 2012, Nessebar, Bulgaria

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.

Citation Download Citation

G. Maleshkov, P. Hansinger, N. Dimitrov, A. Dreischuh, and G. G. Paulus "Branching probe beams by fractional vortex dipoles: guiding vs. anti-guiding", Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87701K (15 March 2013); https://doi.org/10.1117/12.2016385

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KEYWORDS

Laser beam diagnostics

Spiral phase plates

Spatial solitons

Waveguides

Beam propagation method

Beam splitters

Nonlinear optics

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