Influence of astigmatism and defocusing on the focusing of a singular beam

被引：31
|
作者：
Singh, Rakesh Kumar [1 ]
Senthilkumaran, P. [1 ]
Singh, Kehar [1 ]
机构：
[1] Indian Inst Technol, Dept Phys, New Delhi 110016, India
来源：
OPTICS COMMUNICATIONS | 2007年 / 270卷 / 02期
关键词：
diffraction theory; phase singularity; topological charge; astigmatism; intensity; encircled energy;
D O I：
10.1016/j.optcom.2006.09.038
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Using the Fresnel-Kirchhoff diffraction integral, the intensity distribution and encircled energy of a singular beam at the focal plane of a lens, has been numerically evaluated in the presence of astigmatism and defocusing. Study has been made for two values of topological charge. The aberration results in flattening of dark core and the effect is more pronounced for beam with double topological charge. Twofold symmetry in intensity distribution is observed for selected values of defocusing. The results have been verified by the optical transfer function (OTF) approach. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：128 / 138
页数：11
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