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Dynamics of Laser Driven Electron Plasma Wave in Collisionless Plasma with Axial Density Ramp: Effect of Self Focusing
Naveen Gupta, Rohit Johari, Alex A K, Abhay Limbu, Anchit Sinha, Rajnoor Singh and Aatif Ahmad
Dynamics of the laser driven electron plasma waves (EPWs) in plasmas with axial density ramp has been investigated theoretically. The effect of self focusing of the laser beam on the power of laser excited EPW has been incorporated. During its propagation through the plasma, the laser beam excites an EPW at frequency ωep that due to the optical nonlinearity of plasma gets nonlinearly coupled to the laser beam. Using variational theory semi analytical solutions of the coupled nonlinear wave equations for the pump wave and EPW have been obtained under W.K.B approximation technique. It has been observed that power of the EPW is significantly affected by the self-focusing effect of pump beam.
Keywords: Self-Focusing, electron plasma wave, clean energy, cosh-gaussian, ponderomotive force