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Stimulated Raman scattering of self-focused elliptical q-Gaussian laser beam in plasma with axial density ramp: effect of ponderomotive force
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Stimulated Raman scattering of self-focused elliptical q-Gaussian laser beam in plasma with axial density ramp: effect of ponderomotive force
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Journal Article
Stimulated Raman scattering of self-focused elliptical q-Gaussian laser beam in plasma with axial density ramp: effect of ponderomotive force
2022
Overview
The phenomenon of stimulated Raman scattering (SRS) of elliptical
q
-Gaussian laser beams interacting nonlinearly with underdense plasmas has been investigated theoretically. When an intense laser beam with frequency
ω
0
propagates through plasma, due to the nonuniform irradiance over its cross-section d.c component of ponderomotive force becomes active. Due to this ponderomotive nonlinearity of plasma, the laser beam gets coupled with a preexisting electron plasma wave (EPW) at frequency
ω
ep
. The nonlinear interaction of pump beam with EPW produces a back scattered wave at frequency
ω
s
=
ω
0
-
ω
ep
. Using variational theory semi-analytical solution of the set of coupled nonlinear wave equations for the three waves (pump, EPW and scattered) has been obtained under W.K.B approximation technique. It has been observed that power of the scattered wave is significantly affected by the self-focusing effect of pump beam.
Publisher
Springer India,Springer Nature B.V
Subject
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