Abstract
This paper presents a theoretical investigation on stimulated Raman scattering (SRS) of intense Laguerre–Gaussian (LG) laser beams propagating through plasma with axial density ramp. The optical nonlinearity of the plasma has been considered to be originating due the ponderomotive force acting on the plasma electrons due to intensity gradient over the cross section of laser beam. An intense laser beam with frequency \({\omega }_{0}\) propagating through plasma gets coupled with a preexisting electron plasma wave (EPW) at frequency ωep and produces a back scattered wave at frequency \({\omega }_{s}={\omega }_{0}-{\omega }_{ep}\). Using variational theory semi-analytical solution of the set of coupled wave equations for the pump, EPW and scattered wave has been obtained under W.K.B approximation. It has been observed that power of the scattered wave is significantly affected by the self-focusing effect of pump beam.
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Gupta, N., AK, A., Johari, R. et al. Stimulated Raman scattering of self-focused Laguerre–Gaussian laser beams in axially inhomogeneous plasma. J Opt 53, 883–891 (2024). https://doi.org/10.1007/s12596-023-01201-1
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DOI: https://doi.org/10.1007/s12596-023-01201-1