Impact of light absorption and temperature on self-focusing of zeroth-order Bessel-Gauss beams in a plasma with relativistic-ponderomotive regime

摘要

The influence of light absorption and temperature on self-focusing of zeroth-order Bessel-Gauss beams through plasma, with relativistic-ponderomotive regime, is investigated in this paper. The nonlinear differential equation for beam-width is established by using parabolic equation approach under Wentzel-Kramers-Brillouin (WKB) paraxial approximation and solved numerically. The numerical results show the effects of beam parameter, relative density plasma, intensity parameter, absorption coefficient and plasma electron temperature on self-focusing of zeroth-order Bessel-Gauss beams in plasma. The self-focusing of Gaussian beams in the considered plasma is also deduced as a particular case in the present work.