Electron Bernstein wave excitation and heating by nonlinear interactions of Laguerre and Hermite Gaussian laser beams in a magnetized plasma

Abstract

In this paper, we have studied the nonlinear interaction of Laguerre-Gaussian (LG) and Hermite-Gaussian (HG) laser beams in magnetized plasma, and electron Bernstein wave (EBW) excitation and heating of electron is evaluated. The beat wave with frequency ω=(ω1-ω2) and wave vector k→=k→1+k→2, exert a pondermotive force on electrons. This force has potential to drive electron Bernstein wave in both homogeneous and inhomogeneous plasma. The convective loss of waves in inhomogeneous plasma is discussed. An analytical theory is also developed for the anomalous heating of electrons. The variation of normalized potential and power distribution with normalized frequency and beam direction is demonstrated to excite EBWs under resonance conditions. The laser parameters such as beam width, modes index, and frequency affect the EBWs excitation and rate of electron heating. In addition, the spatial tuned shape of beams and the optimum laser beams parameter is proposed for much more exaction and heating.