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Opt Express. 2008 Jan 21;16(2):993-1006.

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

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Department of Physics and Astronomy, SUPA, University of Glasgow, Glasgow G12 8QQ, UK.


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.

[Indexed for MEDLINE]

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