Abstract
We investigate the phenomenon of stimulated Brillouin scattering (SBS) of q-Gaussian laser beams nonlinearly-interacting with underdense plasmas. When an intense laser beam with frequency ω0 propagates through plasma, due to relativistic mass nonlinearity of plasma electrons, it gets coupled to a preexisting-ion acoustic wave (IAW) at frequency ωia. The nonlinear interaction of pump beam with IAWproduces a back-scattered wave at frequency ωs = ω0−ωia. In view of the variational theory, we obtain semi-analytical solutions of the coupled nonlinear wave equations for the three waves (pump, IAW, and scattered wave) under the Wentzel-Kramers-Brillouin (WKB) approximation. We show that the scattered-wave power is significantly affected by the self-focusing effect of the pump beam.
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Gupta, N., Choudhry, S., Bhardwaj, S.B. et al. Relativistic Effects on Stimulated Brillouin Scattering of Self-Focused q-Gaussian Laser Beams in Plasmas with Axial Density Ramp. J Russ Laser Res 42, 418–429 (2021). https://doi.org/10.1007/s10946-021-09978-x
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DOI: https://doi.org/10.1007/s10946-021-09978-x