Magnetic field effect on self focusing of high intensity gussian laser beam in underdense plasma

Summary form only given. The evolution of spot size of an intense laser beam in cold, underdense, axially magnetized plasma has been investigated. The external static magnetic field is along the direction of radiation laser field propagation. Non-linear current density is derived up to the third order of perturbation taking into account the Faraday rotation effect in zero order approximation. The evolution of the spot size for a gussian beam profile determined making used of the variational principle approach method. It is shown that like to the transversally magnetized plasma1, in the case of axial magnetization, the self focusing property enhanced compared to the non-magnetized plasma case. In our investigation self focusing property is enhanced by transverse magnetic field stronger than the axial case.