Third Harmonic Generation of q-Gaussian Laser Beam in Collisionless Plasma
Abstract
The current study investigates third harmonic generation (THG) of a q-Gaussian beam propagating through collisionless plasma. The density gradients get induced in plasma due to nonlinear ponderomotive force. They excite electron plasma wave (EPW) at twice pump frequency via V->xB-> mechanism. EPWs and pump wave couples with each other producing third harmonics. The nonlinear ODE for beam waist of pump beam and THG conversion efficiency expressions are obtained by employing WKB and paraxial approaches. The influence of key laser-plasma parameters on self-focusing of main beam and 3rd harmonic efficiency is also analyzed.
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References
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