Spatial distribution of spontaneous parametric down-converted photons for higher order optical vortices

OPTICS COMMUNICATIONS

卷:326

Article

Prabhakar, Shashi¹  Reddy, Salla Gangi¹  Aadhi, A.¹  Kumar, Ashok²  Chithrabhanu, P.¹  Samanta, G. K.¹  Singh, R. P.¹ 

[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India

[2] Univ Sao Paulo, Inst Fis, BR-66318 Sao Paulo, Brazil

关键词: Parametric down-conversion;    Optical vortex;    Entanglement;    Critical beam-width;   

DOI  :  10.1016/j.optcom.2014.04.017

来源: Elsevier

【 摘 要 】

We make a source of entangled photons using spontaneous parametric clown-conversion (SPDC) in a non-linear crystal and study the spatial distribution of photon pairs obtained through the down-conversion of different modes of light including higher order vortices. We observe that for the Gaussian pump, the thickness of the SPDC ring varies linearly with the radius of pump beam. However, in case of vortex carrying beams, two concentric SPDC rings are formed for beams above a critical radius. The full width at half maximum (FWHM) of SPDC rings increase with increase in the order of optical vortex beams. The presence of a critical beam width for the vortices as well as the observed FWHM of the SPDC rings are supported with our numerical results. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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