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  • Vol. 36, Iss. 6 — Mar. 15, 2011
  • pp: 787–789

Measuring vortex charge with a triangular aperture

Luís E. E. de Araujo and Matthew E. Anderson  »View Author Affiliations


Optics Letters, Vol. 36, Issue 6, pp. 787-789 (2011)
http://dx.doi.org/10.1364/OL.36.000787


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Abstract

A triangular aperture illuminated with a vortex beam creates a truncated lattice diffraction pattern that identifies the charge of the vortex. In this Letter, we demonstrate the measurement of vortex charge via this approach for vortex beams up to charge ± 7 . We also demonstrate the use of this technique for measuring femtosecond vortices and noninteger vortices, comparing these results with numerical modeling. It is shown that this technique is simple and reliable, but care must be taken when interpreting the results for the noninteger case.

© 2011 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Diffraction and Gratings

History
Original Manuscript: November 29, 2010
Revised Manuscript: January 28, 2011
Manuscript Accepted: January 30, 2011
Published: March 4, 2011

Citation
Luís E. E. de Araujo and Matthew E. Anderson, "Measuring vortex charge with a triangular aperture," Opt. Lett. 36, 787-789 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-6-787


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