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International Journal of OpticsVolume 2012 2012, Article ID 249695, 7 pages

Research Article

Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India

Laser Science and Technology Centre, Metcalfe House, Delhi 110054, India

Received 25 March 2011; Accepted 20 June 2011

Academic Editor: Jan Masajada

Copyright © 2012 Sunil Vyas 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.


Vortices of different charges are embedded in a wavefront that has quadratic phase variation, and the intensity distribution near the focal plane is studied. This method may be useful in realizing complicated beam profiles. We have experimentally demonstrated the generation of vortex arrays having integer as well as fractional topological charges that produce different intensity profiles at the focal plane. The phase variation realized on a spatial light modulator SLM acts as a Fresnel lens with embedded vortices.

Autor: Sunil Vyas, Rakesh Kumar Singh, Devinder Pal Ghai, and P. Senthilkumaran



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