Abstract
Dependence of Raman scattering on the orbital angular momentum of light
Highlights
We consider two pump cases – circularly and linearly polarized orbital angular momentum (OAM) beams
While the circularly polarized OAM beam behaves like any other fiber mode, a linearly polarized OAM beam is a superposition of left and righthanded circularly polarized σ± fiber modes with the same L. Since these two modes are non-degenerate in effective index [4], we obtain a state that experiences circular birefringence ∆neff, and optical activity (OA)
At one Stokes shift away from the pump (~1115 nm), it is clear to see that the Raman power of the OA state is 15 dB lower than that of the circularly polarized OAM input [7]
Summary
We consider two pump cases – circularly and linearly polarized OAM beams. Since these two modes are non-degenerate in effective index [4], we obtain a state that experiences circular birefringence ∆neff, and optical activity (OA). Upon fiber-propagation, the mode remains linearly polarized, but rotates in polarization orientation [5].
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