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Proceedings Paper

The defocused helical structure of two superposed vortex beams
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Paper Abstract

Vortex beams have drawn much attention for their distinct properties. When vortex beams propagate along optical axis, they exhibit complicated physical phenomena. Under tight focusing condition, we investigate the defocusing behavior of two superposed vortex beams with opposite but arbitrary topological charge. The results reveal that the intensity distribution of the focus will be petal-shaped if the two topological charges have opposite sign, where the number of intensity lobes in the focal plane is |mn + 2| . Meanwhile, we find that the focusing intensity of topological charge m = −n would not appear the helical structure when a defocusing occurs. Otherwise, the defocusing would result in the helical structure of intensity when m ≠ −n , and the rotation of helical structure depends on the sign of m + n . Of which clockwise rotation of defocus intensity is related to the negative m + n , and anti-clockwise direction corresponds to the positive m + n . Furthermore, the helical degree of the helical intensity also depends on the magnitude of m + n . The interesting results obtained in this paper will lead to further advances in the field of optical vortices.

Paper Details

Date Published: 12 December 2018
PDF: 7 pages
Proc. SPIE 10847, Optical Precision Manufacturing, Testing, and Applications, 108470Z (12 December 2018); doi: 10.1117/12.2505676
Show Author Affiliations
Xuebing Dai, Beijing Institute of Technology (China)
Yanqiu Li, Beijing Institute of Technology (China)
Lihui Liu, Beijing Institute of Technology (China)
Ye Wang, Beijing Institute of Technology (China)
Jianhui Li, Beijing Institute of Technology (China)
Guodong Zhou, Beijing Institute of Technology (China)
Yanjun Chen, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 10847:
Optical Precision Manufacturing, Testing, and Applications
John McBride; JiuBin Tan; Sen Han; Xuejun Zhang, Editor(s)

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