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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 5 — May. 1, 2014
  • pp: 1159–1164

Initiating self-focusing of beams carrying spatial phase singularities

Lyubomir Stoyanov, Georgi Maleshkov, Ivan Stefanov, and Alexander Dreischuh  »View Author Affiliations


JOSA B, Vol. 31, Issue 5, pp. 1159-1164 (2014)
http://dx.doi.org/10.1364/JOSAB.31.001159


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Abstract

In this work, we show both experimentally and by numerical simulations that the presence and evolution of a ring dark beam and/or an on-axis optical vortex nested on a bright background beam noticeably perturb the host background. In a photorefractive nonlinear medium (crystal SBN) these perturbations can initiate self-focusing of the background. By changing the dark ring radius and the presence of an optical vortex and keeping all other experimental parameters unchanged, we can control the dynamics at the initial stage of longitudinal self-focusing and the type of self-focusing structure (single peak or bright ring of variable radius). The presented results may appear especially important in experiments that involve cascaded nonlinear frequency mixing of singular beams, in which accelerated dark beam spreading is accompanied by self-focusing of certain portions of the perturbed host beam.

© 2014 Optical Society of America

OCIS Codes
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
(190.5330) Nonlinear optics : Photorefractive optics
(190.5940) Nonlinear optics : Self-action effects
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Nonlinear Optics

History
Original Manuscript: January 13, 2014
Revised Manuscript: March 1, 2014
Manuscript Accepted: March 25, 2014
Published: April 23, 2014

Citation
Lyubomir Stoyanov, Georgi Maleshkov, Ivan Stefanov, and Alexander Dreischuh, "Initiating self-focusing of beams carrying spatial phase singularities," J. Opt. Soc. Am. B 31, 1159-1164 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-5-1159


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