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Proceedings Paper

Measuring topological charge using Stokes parameters
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Paper Abstract

An alternative method to experimentally measure the topological charge of a vortex beam is presented. The method is based on the number of polarization singularities arising in the superposition of two off-axis Laguerre­-Gauss beams having orthogonal polarizations. The experimental setup consists of a modified Mach-Zehnder interferometer which provides control over the polarization structure by allowing us to introduce lateral displace­ ments as well as relative phase variations between the two arms of the interferometer. A comparison between theoretical and experimental results is done with very good agreement. This method offers an alternative for measuring orbital angular momentum content in a beam without the need of interfering with a reference plane wave. The dynamics of polarization singularities are also studied experimentally.

Paper Details

Date Published: 28 September 2013
PDF: 6 pages
Proc. SPIE 8843, Laser Beam Shaping XIV, 884303 (28 September 2013);
Show Author Affiliations
Benjamin Perez-Garcia, Tecnológico de Monterrey (Mexico)
Dorilian Lopez-Mago, Tecnológico de Monterrey (Mexico)
ETH Zurich (Switzerland)
Adad Yepiz Escalante, Tecnológico de Monterrey (Mexico)
Raul I. Hernandez-Aranda, Tecnológico de Monterrey (Mexico)
Julio C. Gutiérrez-Vega, Tecnológico de Monterrey (Mexico)

Published in SPIE Proceedings Vol. 8843:
Laser Beam Shaping XIV
Andrew Forbes; Todd E. Lizotte, Editor(s)

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