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Stimulated Brillouin Scattering of Elliptical q-Gaussian Laser Beams in Plasmas with Axial Density Ramp: Effect of Self-Focusing
Abstract
Theoretical investigation on stimulated Brillouin scattering of intense q-Gaussian laser beams interacting with axially non-uniform plasmas has been presented. A ramp-shaped density profile has modelled the axial inhomogeneity of the plasma and the optical nonlinearity of the plasma has been considered to be originating owing to the dependence of the relativistic mass of the plasma electrons on laser intensity. An intense laser beam with frequency w0 propagating through plasma gets coupled with a preexisting ion acoustic wave (IAW) at frequency ωia and produces a back-scattered wave at frequency ws = w0 – wia. Using variational theory semi-analytical solution of the set of coupled wave equations for the pump, a IAW and a scattered wave have been obtained under W.K.B. approximation. It has been noted that the power of the scattered wave is significantly affected by the self-focusing effect of the pump beam.
About the Authors
N. Gupta
Университет Пхагвары
India
India
Прагвара
S. Choudhry
Университет Пхагвары;
Государственный колледж для женщин
India
India
Прагвара;
Карнал
S. B. Bhardwaj
Государственный колледж SUS
India
India
Матак-Маджри, Индри, Карнал
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Review
For citations:
Gupta N., Choudhry S., Bhardwaj S.B. Stimulated Brillouin Scattering of Elliptical q-Gaussian Laser Beams in Plasmas with Axial Density Ramp: Effect of Self-Focusing. Zhurnal Prikladnoii Spektroskopii. 2022;89(6):899.
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