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

M. V. Jabir; N. Apurv Chaitanya; A. Aadhi; G. K. Samanta

doi:10.1038/srep21877

journal article Open Access Feb 25, 2016

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

M. V. Jabir N. Apurv Chaitanya A. Aadhi G. K. Samanta

Scientific Reports Vol. 6 No. 1 · Springer Science and Business Media LLC

View at Publisher Save 10.1038/srep21877

Abstract

AbstractThe “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 beams. 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 = 200 mm, we have varied the radius of the vortex beam across 0.3–1.18 mm 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.

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Published: Feb 25, 2016
Vol/Issue: 6(1)
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Cite This Article

M. V. Jabir, N. Apurv Chaitanya, A. Aadhi, et al. (2016). Generation of “perfect” vortex of variable size and its effect in angular spectrum of the down-converted photons. Scientific Reports, 6(1). https://doi.org/10.1038/srep21877

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

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