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Measuring the topological charge of light beams generated by four-wave mixing in Rb vapours

Jack B. Muir, Nafia Rahaman, A. M. Akulshin, Russell McLean

Published Jan 1, 2018• 0 citations
Publisher

Abstract

Collimated light generated via four wave mixing in atomic rubidium vapours excited by light carrying orbital angular momentum is analyzed, particularly the case of doughnut-shaped intensity profiles with zero topological charge.
DOI
10.1364/cleopr.2018.w3a.113

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We suggest a technique based on the transfer of topological charge from applied laser radiation to directional and coherent optical fields generated in ladder-type excited atomic media to identify the major processes responsible for their appearance. As an illustration, in Rb vapors, we analyze transverse intensity and phase profiles of the forward-directed collimated blue and near-IR light using self-interference and astigmatic transformation techniques when either or both of two resonant laser beams carry orbital angular momentum. Our observations unambiguously demonstrate that emission at 1.37 μm is the result of a parametric four-wave mixing process involving only one of the two applied laser fields.
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