Raman scattering of a laser beam carrying an orbital angular momentum

0561514 - FZÚ 2023 RIV US eng J - Journal Article
Nuter, R. - Korneev, Ph. - Tikhonchuk, Vladimir
Raman scattering of a laser beam carrying an orbital angular momentum.
Physics of Plasmas. Roč. 29, č. 6 (2022), č. článku 062101. ISSN 1070-664X. E-ISSN 1089-7674
Institutional support: RVO:68378271
Keywords : raman scattering * orbital angular momentum
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1063/5.0086700

We study theoretically and numerically the Raman backscattering process of a laser beam carrying an orbital angular momentum. By expanding the electromagnetic and electrostatic waves over the Laguerre–Gauss modes, we retrieve the strong dependence of the growth rate on the radial overlap of these functions. The presence of an orbital angular momentum in the laser beam results in a mitigation of the Raman backscattering by 30%. This is confirmed with three-dimensional particle-in-cell simulations. Both the theoretical description and numerical analysis show that the scattered electromagnetic wave is generated with an azimuthal order equal to the laser beam’s.
Permanent Link: https://hdl.handle.net/11104/0334105