Volume 111, Number 3, August 2015
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||24 August 2015|
Analysis of the topological charge of vortex beams using a hole wheel
1 Université de Rennes 1 - 35042 Rennes Cedex, France, EU
2 IPR, UMR CNRS 6251, Université de Rennes 1 - 35042 Rennes Cedex, France, EU
3 Laboratoire Aimé Cotton, UMR 9188, CNRS, Université Paris-Sud, ENS-Cachan - 91405, Orsay, France, EU
4 IETR, UMR CNRS 6164, Université de Rennes 1 - 35042 Rennes Cedex, France, EU
Received: 5 June 2015
Accepted: 24 July 2015
The measurement of the topological charge of a vortex beam is demonstrated using the diffraction pattern produced by hole wheel. The resulting mandala-like interference pattern depends on the number of holes relatively to the topological charge. The interference at the centre of the pattern —bright or dark—enables us to determine the topological charge in a procedure when hole wheels with different number of holes are applied. This method is direct and wavelength independent. It does not require any image analysis and could find applications in classical telecommunications or quantum optics using twisted light.
PACS: 42.50.Tx – Optical angular momentum and its quantum aspects / 42.25.Fx – Diffraction and scattering / 42.30.Rx – Phase retrieval
© EPLA, 2015
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