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Proceedings Paper

Alterable focal shift of concentric piecewise cylindrical vector beam
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Paper Abstract

Focal shift plays an important in many optical fusing systems. In this article, focal shift of concentric piecewise cylindrical vector beam is investigated by means of vector diffraction theory in detail. The section of the beam consists of three concentric zones. The center circle zone and outer annular zone are radial polarized, and the inner annular zone is generalized polarized. In addition the wavefront phase distribution of the vector beam is linear function to radial coordinate. It is found that the parameter in phase distribution induces focal shift and can alter focal shift considerably. However, radii of the inner annular zone and polarization angle do affect focal shift very slightly. So the phase parameter can be used to alter big focal shift while the radii and polarization angle may be employed to adjust intensity distribution. In focusing system, the focal shift and intensity distribution may be controlled separately, which improves the application freedom of this kind of technique. Focal shift direction can also be altered by change the phase parameter.

Paper Details

Date Published: 30 October 2009
PDF: 6 pages
Proc. SPIE 7497, MIPPR 2009: Medical Imaging, Parallel Processing of Images, and Optimization Techniques, 74970X (30 October 2009); doi: 10.1117/12.832338
Show Author Affiliations
Qiufang Zhan, China Standard Software Co., Ltd. (China)
Jinsong Li, China Jiliang Univ. (China)
Xiumin Gao, Hangzhou Dianzi Univ. (China)
Univ. of Shanghai for Science and Technology (China)


Published in SPIE Proceedings Vol. 7497:
MIPPR 2009: Medical Imaging, Parallel Processing of Images, and Optimization Techniques
Faxiong Zhang; Faxiong Zhang, Editor(s)

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