Journal
OPTICS EXPRESS
Volume 18, Issue 17, Pages 17796-17804Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.017796
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Funding
- Casio foundation
- KDDI foundation
- Japan Society for the Promotion of Science (JSPS) [20360025]
- Grants-in-Aid for Scientific Research [20360025] Funding Source: KAKEN
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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 (LG(0)) 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 LG(0) is realized by the superposition of LG(0) with an anti-balanced phase in the pump. (C) 2010 Optical Society of America
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