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International Journal of Optics
Volume 2012, Article ID 689612, 7 pages
http://dx.doi.org/10.1155/2012/689612
Research Article

Generation of Optical Vortex Arrays Using Single-Element Reversed-Wavefront Folding Interferometer

1Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
2Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

Received 15 April 2011; Revised 7 June 2011; Accepted 8 June 2011

Academic Editor: Shunichi Sato

Copyright © 2012 Brijesh Kumar Singh 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

Optical vortex arrays have been generated using simple, novel, and stable reversed-wavefront folding interferometer. Two new interferometric configurations were used for generating a variety of optical vortex lattices. In the first interferometric configuration one cube beam splitter (CBS) was used in one arm of Mach-Zehnder interferometer for splitting and combining the collimated beam, and one mirror of another arm is replaced by second CBS. At the output of interferometer, three-beam interference gives rise to optical vortex arrays. In second interferometric configuration, a divergent wavefront was made incident on a single CBS which splits and combines wavefronts leading to the generation of vortex arrays due to four-beam interference. It was found that the orientation and structure of the optical vortices can be stably controlled by means of changing the rotation angle of CBS.