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We make a source of entangled photons (SEP) using spontaneous parametricdown-conversion (SPDC) in a non-linear crystal and study the spatialdistribution of photon pairs obtained through the down-conversion of differentmodes of light including higher order vortices. We observe that for theGaussian pump, the thickness of the SPDC ring varies linearly with the radiusof pump beam. However, in case of vortex carrying beams, two concentric SPDCrings are formed for beams above a critical radius. The full width at halfmaximum (FWHM) of SPDC rings increase with increase in the order of opticalvortex beams. The presence of a critical beam width for the vortices as well asthe observed FWHM of the SPDC rings are supported with our numerical results.

Spatial distribution of Spontaneous Parametric Down-Converted Photons for higher order Optical Vortices