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Abstract
A harmonic electromagnetic beam oscillating at an arbitrary number, say L, of orbital angular momentum (OAM) states and having any polarization properties is shown to be characterized by means of a L × 2 tensor. The projection of the tensor to the polarization plane is found to contain information about the OAM-state mixing and radially resolved polarization of the beam. In particular, the degree of orbital polarization and the orbital polarization ellipse are introduced.
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