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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 17796–17804

Dynamics of a paired optical vortex generated by second-harmonic generation

Y. Toda, S. Honda, and R. Morita  »View Author Affiliations

Optics Express, Vol. 18, Issue 17, pp. 17796-17804 (2010)

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We study the dynamics of a paired optical vortex (OV) generated by second-harmonic generation (SHG) using sub-picosecond pulses. By changing the position of a thin nonlinear crystal along the propagation direction, we observe a rotation of two vortices with changing separation distance. The dynamics is well explained by SHG with a beam walk-off, which introduces a contamination of zero-order Laguerre-Gaussian beam (LG0) together with topological charge doubling. The quantitative analysis indicates that the rotation angle of the OVs manifests the Gouy phase while the splitting provides the walk-off angle of the crystal. We also show that the subtraction of LG0 is realized by the superposition of LG0 with an anti-balanced phase in the pump.

© 2010 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(050.4865) Diffraction and gratings : Optical vortices
(260.6042) Physical optics : Singular optics

ToC Category:
Nonlinear Optics

Original Manuscript: June 15, 2010
Revised Manuscript: July 21, 2010
Manuscript Accepted: July 28, 2010
Published: August 3, 2010

Y. Toda, S. Honda, and R. Morita, "Dynamics of a paired optical vortex generated by second-harmonic generation," Opt. Express 18, 17796-17804 (2010)

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