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Self-focusing and self-phase modulation of an elliptic Gaussian laser beam in collisionless magnetoplasma



The problem of nonlinear self-focusing of elliptic Gaussian laser beam in collisionless magnetized plasma is studied using variation approach. The dynamics of the combined effects of nonlinearity and spatial diffraction is presented. With a and b as the beam width parameters of the beam along x and y directions, respectively, the phenomenon of cross-focusing is observed where focusing of a results in defocusing of b and vice versa. Although no stationary self-trapping is observed, oscillatory self-trapping occurs far below the threshold. The regularized phase is always negative.


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Address correspondence and reprint requests to: Nareshpal Singh Saini, Department of Physics, Guru Nanak Dev University, Amritsar-143005, India. E-mail:


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