Abstract
A theoretical investigation has been conducted to analyze the dynamics of electron plasma waves (EPWs) induced by Bessel–Gauss laser beams in plasmas featuring an axial density ramp. The study involves evaluating how the self-focusing of the laser beam influences the power of the laser-excited EPWs. As the laser beam traverses the plasma, it triggers the generation of an EPW at the frequency \({{\varvec{\omega}}}_{\mathbf{e}\mathbf{p}}\). This EPW, affected by the optical nonlinearity of the plasma, becomes nonlinearly coupled to the laser beam due to the ponderomotive nonlinearity of plasma electrons. Employing variational theory, semi-analytical solutions for the coupled nonlinear wave equations governing the pump wave and EPW have been obtained using the W.K.B approximation technique. The findings highlight a significant impact of the self-focusing effect of the pump beam on the power of the EPW.
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Gupta, N., K, A.A., Partap, R. et al. Effect of self-focusing of bessel gauss laser beam on excitation of electron plasma wave in collisionless plasma with axial density ramp. J Opt (2024). https://doi.org/10.1007/s12596-024-01700-9
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DOI: https://doi.org/10.1007/s12596-024-01700-9