Determination of topological charges of polychromatic optical vortices

Vladimir Denisenko, Vladlen Shvedov, Anton S. Desyatnikov, Dragomir N. Neshev, Wieslaw Krolikowski, Alexander Volyar, Marat Soskin, Yuri S. Kivshar

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


We introduce a simple, single beam method for determination of the topological charge of polychromatic optical vortices. It is based on astigmatic transformation of singular optical beams, where the intensity pattern of a vortex beam acquires a form of dark stripes in the focal plane of a cylindrical lens. The number of the dark stripes is equal to the modulus of the vortex topological charge, while the stripe tilt indicates the charge sign. We demonstrate experimentally the effectiveness of this technique by revealing complex topological structure of polychromatic singular beams.

Original languageEnglish
Pages (from-to)23374-23379
Number of pages6
JournalOptics Express
Issue number26
Publication statusPublished - Dec 21 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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