Abstract
The definition of the orbital angular momentum established for coherent
beams is extended to partially coherent beams, expressed in terms of two elements
of the beam matrix. This extension is justified by use of the Mercer expansion
of partially coherent fields. General Gauss–Schell-model
fields are considered, and the relation between the twist parameter and the
orbital angular momentum is analyzed.
© 2001 Optical Society of America
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