Backward stimulated Brillouin scattering spatial gain with polarization, spatial, and temporal beam smoothing techniques

A recent study [Ruyer et al., Phys. Rev. E 107, 035208 (2023)] modeling the influence of a random phase plate on the backward stimulated Brillouin scattering growth is here supplemented with the effect of temporal and polarization smoothing. Our analytical predictions are validated by a large number...

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Bibliographic Details
Published in:Physics of plasmas 2023-12, Vol.30 (12)
Main Authors: Ruyer, C., Fusaro, A., Capdessus, R., Debayle, A., Loiseau, P., Masson-Laborde, P. E., Morice, O.
Format: Article
Language:English
Subjects:
Differential equations
Laser plasmas
Magnetohydrodynamic stability
Modelling
Phase plates
Plasma physics
Polarization
Ray tracing
Scattering
Smoothing
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Summary:A recent study [Ruyer et al., Phys. Rev. E 107, 035208 (2023)] modeling the influence of a random phase plate on the backward stimulated Brillouin scattering growth is here supplemented with the effect of temporal and polarization smoothing. Our analytical predictions are validated by a large number of three dimensional Hera paraxial simulations for various beam smoothing techniques and relevant to most high energy laser facilities. Neglecting all non-linear effects apart from the pump depletion, we then reconstruct the system of differential equations that the backward stimulated Brillouin scattering convective amplification of a smoothed beam propagating in a non-homogeneous plasma satisfies. Its resolution is successfully confronted with our simulation data and prepares the accurate modeling, in a ray tracing scheme, of the effect of laser smoothing techniques on laser plasma instabilities.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0161176