Numerical study of nonlinear current density produced by beating of two chirped lasers in plasma with density-ripple

Abstract

Abstract In the present model, a detailed theoretical investigation of the nonlinear current density produced by beating of chirped pulse lasers in plasma having spatial ripple density is conducted. In our mechanism, we consider two Gaussian lasers with electric fields E → 1 and E → 2 propagating along z ^ , polarized along ŷ direction. The lasers have a linear frequency chirp and the frequency Ω1 and Ω2can be chosen as the required frequency range. A transverse nonlinear ponderomotive force is experienced by the plasma electrons due to the lasers beating in plasma. As a consequence, plasma electrons get an oscillatory velocity that paired with the density ripple to generate a stronger transient transverse nonlinear current. Our theoretical simulation unveil that by optimizing the chirp parameter a prominent change in nonlinear oscillating current is depicted.