| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 852767 | Optik - International Journal for Light and Electron Optics | 2008 | 6 Pages |
Abstract
Focusing of a singular beam by a lens in the presence of spherical aberration and defocusing is studied by using Fresnel–Kirchhoff diffraction integral for two different values of topological charge. Results of intensity distribution and encircled energy are plotted for defocused observation planes. Spherical aberration spreads the dark core and reduces the intensity at maxima. The results have been verified by the optical transfer function (OTF) approach.
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Authors
Rakesh Kumar Singh, P. Senthilkumaran, Kehar Singh,