Author:Romero, J; Giovannini, D; McLaren, MG; Galvez, EJ; Forbes, A; Padgett, MJDate:Aug 2012We 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 ...Read more
Author:McLaren, M; Romero, J; Padgett, MJ; Roux, FS; Forbes, ADate:Sep 2013In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general theoretical expression for the orbital angular momentum (OAM) ...Read more