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Light beams with fractional orbital angular momentum and their vortex structure.

  • Author(s): Götte, Jörg B;
  • O'Holleran, Kevin;
  • Preece, Daryl;
  • Flossmann, Florian;
  • Franke-Arnold, Sonja;
  • Barnett, Stephen M;
  • Padgett, Miles J
  • et al.
Abstract

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.

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