Romero, JGiovannini, DMcLaren, MGGalvez, EJForbes, APadgett, MJ2012-11-212012-11-212012-08Romero, J, Giovannini, D, McLaren, M.G, Galvez, E.J, Forbes, A and Padgett, MJ. 2012. Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam. Journal of Optics, Vol. 14 (8), doi:10.1088/2040-8978/14/8/0854012040-89782040-8986http://iopscience.iop.org/2040-8986/14/8/085401/http://hdl.handle.net/10204/6347Copyright: 2012 European Optical Society. This is an ABSTRACT ONLY. The definitive version is published in Journal of Optics, Vol. 14 (8), doi:10.1088/2040-8978/14/8/085401We 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 p-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.enOrbital angular momentumOAMOpticsGaussian pump beamsQuantum opticsLasersSpontaneous parametric down-conversionArticleRomero, J., Giovannini, D., McLaren, M., Galvez, E., Forbes, A., & Padgett, M. (2012). Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam. http://hdl.handle.net/10204/6347Romero, J, D Giovannini, MG McLaren, EJ Galvez, A Forbes, and MJ Padgett "Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam." (2012) http://hdl.handle.net/10204/6347Romero J, Giovannini D, McLaren M, Galvez E, Forbes A, Padgett M. Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam. 2012; http://hdl.handle.net/10204/6347.TY - Article AU - Romero, J AU - Giovannini, D AU - McLaren, MG AU - Galvez, EJ AU - Forbes, A AU - Padgett, MJ AB - 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 p-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. DA - 2012-08 DB - ResearchSpace DP - CSIR KW - Orbital angular momentum KW - OAM KW - Optics KW - Gaussian pump beams KW - Quantum optics KW - Lasers KW - Spontaneous parametric down-conversion LK - https://researchspace.csir.co.za PY - 2012 SM - 2040-8978 SM - 2040-8986 T1 - Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam TI - Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam UR - http://hdl.handle.net/10204/6347 ER -