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Opt Express. 2012 May 21;20(11):12292-302. doi: 10.1364/OE.20.012292.

Creating well-defined orbital angular momentum states with a random turbulent medium.

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  • 1Science Applications International Corporation, Albuquerque, New Mexico, USA.


Previous work by Allen, demonstrated that optical beams possess orbital angular momentum. Other work has shown that a random, phase-only disturbance can impart ± 1 orbital angular momentum states to propagating waves. However, the field preceding the formation of these ± 1 states was unknown. In this paper, we identify the unique field that leads to the formation of a pair of branch points, indicators of orbital angular momentum. This field is then verified in a bench-top optical experiment.

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