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Stimulated Brillouin Scattering of Elliptical q-Gaussian Laser Beams in Plasmas with Axial Density Ramp: Effect of Self-Focusing

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Journal of Applied Spectroscopy Aims and scope

Theoretical investigation on stimulated Brillouin scattering of intense q-Gaussian laser beams interacting with axially nonuniform 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 ω0 propagating through plasma gets coupled with a preexisting ion acoustic wave (IAW) at frequency ωia and produces a backscattered wave at frequency ωs = ω0 – ωia. Using variational theory semi-analytical solution of the set of coupled wave equations for the pump, an 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.

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Authors and Affiliations

  1. Lovely Professional University, Phagwara, India

    Naveen Gupta & Suman Choudhry

  2. Government College for Women, Karnal, India

    Suman Choudhry

  3. SUS Government College, Matak-Majri, Indri, Karnal, India

    S. B. Bhardwaj

Authors
  1. Naveen Gupta
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  2. Suman Choudhry
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  3. S. B. Bhardwaj
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Correspondence to Naveen Gupta.

Additional information

Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 89, No. 6, p. 899, November–December, 2022.

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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. J Appl Spectrosc 89, 1168–1176 (2023). https://doi.org/10.1007/s10812-023-01483-0

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  • DOI: https://doi.org/10.1007/s10812-023-01483-0

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