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Dynamics of a paired optical vortex generated by second-harmonic generation |
Optics Express, Vol. 18, Issue 17, pp. 17796-17804 (2010)
http://dx.doi.org/10.1364/OE.18.017796
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Abstract
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
History
Original Manuscript: June 15, 2010
Revised Manuscript: July 21, 2010
Manuscript Accepted: July 28, 2010
Published: August 3, 2010
Citation
Y. Toda, S. Honda, and R. Morita, "Dynamics of a paired optical vortex generated by second-harmonic
generation," Opt. Express 18, 17796-17804 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-17-17796
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