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The Scientific World Journal
Volume 2014, Article ID 160945, 5 pages
http://dx.doi.org/10.1155/2014/160945
Research Article

Partially Coherent, Radially Polarized Beam with Annular Apodization

1Department of ECE, National College of Engineering, Tirunelveli, Tamilnadu 627007, India
2Department of Physics, Chikkanna Government Arts College, Tirupur, Tamilnadu 641602, India
3Department of Physics, University College of Engineering, Nagercoil, Tamilnadu 629002, India

Received 30 August 2013; Accepted 29 October 2013; Published 19 January 2014

Academic Editors: B. Gu and D.-S. Seo

Copyright © 2014 C. Mariyal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM ( ) is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.