Abstract
On the basis of the irradiance-moment formalism for describing general partially coherent beams, we investigate the relation between the spatial orientation of the transverse beam profile upon propagation and the asymmetrical part of its orbital angular momentum (OAM). More specifically, a necessary and sufficient condition (one-to-one correspondence) is shown between freely propagating non-rotating beams and vanishing asymmetrical OAM. As a corollary, it is obtained that any beam emerging from optical systems that transform a rotating field into a non-rotating beam exhibits vortex OAM only.
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Martínez-Herrero, R., Mejías, P.M. Relation between asymmetrical orbital angular momentum and irradiance-profile rotation for partially coherent beams. Appl. Phys. B 101, 343–346 (2010). https://doi.org/10.1007/s00340-010-4136-1
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DOI: https://doi.org/10.1007/s00340-010-4136-1