Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam

Romero, J., Giovannini, D., McLaren, M.G., Galvez, E.J., Forbes, A. and Padgett, M.J. (2012) Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam. Journal of Optics, 14(8), 085401. (doi:10.1088/2040-8978/14/8/085401)

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Abstract

We report orbital angular momentum (OAM) and angle correlations between signal and idler photons observed when the nonlinear crystal used in spontaneous parametric down-conversion is illuminated by a non-fundamental Gaussian pump beam. We introduce a π-phase step to the transverse profile of the pump, before it impinges on the crystal to create a phase-flipped Gaussian mode, which is a close approximation to an HG10 Hermite–Gaussian-like beam. The correlations in OAM and angular position are then measured holographically using two separate spatial light modulators in the signal and idler arms. We show the transfer of the OAM spectrum of the pump to the down-converted fields, manifested as a redistribution in the OAM correlations consistent with OAM conservation. This corresponds to a modulation of the angular position correlations consistent with the Fourier relationship between the OAM and angle.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Romero, Dr Mary and Giovannini, Dr Daniel
Authors: Romero, J., Giovannini, D., McLaren, M.G., Galvez, E.J., Forbes, A., and Padgett, M.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Optics
Publisher:Institute of Physics Publishing Ltd.
ISSN:2040-8978
ISSN (Online):2040-8986
Published Online:01 August 2012

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