Abstract
Nonlinear optical self-action effects like self-focusing, self-trapping of intense laser beams propagating through underdense plasmas have been investigated theoretically. The optical nonlinearity of the plasma has been modelled by ponderomotive force originating through intensity gradient over the cross section of the laser beam. In order to investigate the effect of orbital angular momentum of the photons on propagation characteristics of the laser beam, the irradiance over the cross section of the beam has been considered to be Laguerre Gaussian (LG). Effect of self-focusing of the laser beam on the evolution of its axial phase also has been investigated. Formulation is based on finding semi-analytical solution for the wave equation for the field of laser beam with the help of moment theory approach.
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