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

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Title: Dynamics of a paired optical vortex generated by second-harmonic generation
Authors: Toda, Y. Browse this author →KAKEN DB
Honda, S. Browse this author
Morita, R. Browse this author
Issue Date: 16-Aug-2010
Publisher: Optical Society of America
Journal Title: Optics Express
Volume: 18
Issue: 17
Start Page: 17796
End Page: 17804
Publisher DOI: 10.1364/OE.18.017796
PMID: 20721167
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.
Rights: © 2010 Optical Society of America
Type: article
URI: http://hdl.handle.net/2115/47955
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 戸田 泰則

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