Light beams with fractional orbital angular momentum and their vortex structure

J.B. Gotte, K. O'Holleran, D. Preece, F. Flossmann, S. Franke-Arnold, S.M. Barnett, M.J. Padgett

Research output: Contribution to journalArticlepeer-review

188 Citations (Scopus)


Light emerging from a spiral phase plate with a non-integer phase step has a complicated vortex structure and is unstable on propagation. We generate light carrying fractional orbital angular momentum (OAM) not with a phase step but by a synthesis of Laguerre-Gaussian modes. By limiting the number of different Gouy phases in the superposition we produce a light beam which is well characterised in terms of its propagation. We believe that their structural stability makes these beams ideal for quantum information processes utilising fractional OAM states.
Original languageEnglish
Pages (from-to)993-1006
Number of pages13
JournalOptics Express
Issue number2
Publication statusPublished - 21 Jan 2008


  • light beams
  • fractional orbital angular momentum
  • vortex structure


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