Generation of perfect vortex of variable size and its effect in angular spectrum of the down-converted photon

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dc.contributor.author Jabir, M. V.
dc.contributor.author Apurv Chaitanya, N.
dc.contributor.author Aadhi, A.
dc.contributor.author Samanta, Goutam Kumar
dc.date.accessioned 2016-04-16T16:49:30Z
dc.date.available 2016-04-16T16:49:30Z
dc.date.issued 2016-01
dc.identifier.citation Jabir, M. V.; Apurv Chaitanya, N.; Aadhi, A. and Samanta, Goutam K., “Generation of perfect vortex of variable size and its effect in angular spectrum of the down-converted photon”, arXiv, Cornell University Library, DOI: arXiv:1601.03129, Jan. 2016. en_US
dc.identifier.other http://arxiv.org/abs/1601.03129
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2206
dc.description.abstract The perfect vortex is a new class of optical vortex beam having ring radius independent of its topological charge (order). One of the simplest techniques to generate such beams is the Fourier transformation of the Bessel-Gauss beam. The variation in ring radius of such vortices require Fourier lenses of different focal lengths and or complicated imaging setup. Here we report a novel experimental scheme to generate perfect vortex of any ring radius using a convex lens and an axicon. As a proof of principle, using a lens of focal length f=200mm, we have varied the radius of the vortex beam across 0.3-1.18mm simply by adjusting the separation between the lens and axicon. This is also a simple scheme to measure the apex angle of an axicon with ease. Using such vortices we have studied non-collinear interaction of photons having orbital angular momentum (OAM) in spontaneous parametric down-conversion (SPDC) process and observed that the angular spectrum of the SPDC photons are independent of OAM of the pump photons rather depends on spatial profile of the pump beam. In the presence of spatial walk-off effect in nonlinear crystals, the SPDC photons have asymmetric angular spectrum with reducing asymmetry at increasing vortex radius. en_US
dc.description.statementofresponsibility by M. V. Jabir et al.
dc.language.iso en_US en_US
dc.publisher Cornell University Library en_US
dc.subject Optics en_US
dc.subject Vortices en_US
dc.subject Topological charge en_US
dc.subject Axicon en_US
dc.subject SPDC en_US
dc.subject Orbital angular momentum en_US
dc.title Generation of perfect vortex of variable size and its effect in angular spectrum of the down-converted photon en_US
dc.type Preprint en_US


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