Observation of OAM sidebands due to optical reflection

Details Observation of OAM sidebands due to optical reflection Observation of OAM sidebands due to optical reflection

2012-04-18

arxiv.org/abs/1204.4003v1

Physics

Optics

5 pages

Scientific paper

We investigate how the orbital angular momentum (OAM) of a paraxial light beam is affected upon reflection at a planar interface. Theoretically, the unavoidable angular spread of the (paraxial) beam leads to OAM sidebands which are found to be already significant for modest beam spread (0.05). In analogy to the polarization Fresnel coefficients we develop a theory based upon spatial Fresnel coefficients; this allows straightforward prediction of the strength of the sidebands. We confirm this by experiment.

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