Effect of light absorption and critical beam power on self-focusing of Gaussian laser beam in collision less magnetized plasma

Abstract

In the present paper, authors have studied the effect of light absorption and critical beam power on self-focusing of Gaussian laser beam propagating through collisionless magnetized plasma. The field distribution in the medium is expressed in terms of beam-width parameter and absorption coefficient. Usual parabolic equation approach under WKB and paraxial approximations is employed to obtain the differential equation for beam width parameter. It is found that critical critical beam power and absorption coefficient play vital role in propagation of Gaussian laser beam in collisionless magnetized plasma. The behavior of beam-width parameter with the normalized distance of propagation is studied at various values of critical beam power with different absorption levels in magnetized plasma. The results are presented in the form of graphs and discussed.