Abstract
This paper presents a theoretical investigation on optical self action effects of multi Gaussian (M.G) laser beams interacting with thermal quantum plasmas. Due to the non uniform irradiance over the cross section of the laser beam, the DC component of the ponderomotive force becomes finite, leading to evacuation of electrons from high intensity regions. The resulting redistribution of the plasma electrons modifies the optical properties of the plasma in nonlinear fashion and thus affects the propagation characteristic of the laser beam. The formulation is based on finding the semi analytical solution of the nonlinear Schrodinger wave equation (NLSE) governing the evolution of laser beams in nonlinear media. Particularly the dynamical evolutions of the beam with and longitudinal phase of the laser beam with longitudinal distance through the plasma have been investigated in detail.
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