Abstract
By analysis of the far-field cross-correlation function (CCF) of partially
coherent optical beams, we demonstrate an implicit rule that the number of ring
dislocations (dark zones) of the far-field CCF is equal to the original
topological charge of an optical vortex rendered partially coherent. This novel
link between an optical vortex and its correlation singularity may offer an
efficient method for measuring the orbital angular momentum of partially
coherent optical vortices in fields such as astrophysics and astronomy, as well
as atmospheric laser communication.
© 2012 Optical Society of America
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