Propagation characters of dark and antidark Gaussian laser beams in collisionless magnetized plasma

Theoretical investigation of propagation dynamics of dark and antidark Gaussian (DADG) laser beams in magnetized plasma has been presented. Main source of nonlinearity in dielectric constant of magnetized plasma considered herein is of ponderomotive type. Parabolic equation approach under WKB and paraxial approximations has been used to obtain nonlinear differential equation for beam-width parameter of DADG beams. Three distinct regions characterizing steady divergence, oscillatory divergence and self-focusing of DADG beams have been identified with the help of critical and divider curves. The variation of beam-width parameter of DADG beams with distance of propagation has been specifically explored. Finally, the role of magnetic field in the plasma affecting the propagation characteristics of the DADG beams has been introduced. It is seen that propagation characters show strong dependence on the control parameter \(\beta\) $\beta$ of DADG beams.