  One dimensional Particle-in-cell simulations using OSIRIS-4.0 has been
conducted to study the interaction of a laser electromagnetic pulse with an
overdense magnetized plasma target. The external magnetic field has been chosen
to be directed along the laser propagation direction. This geometry supports
the propagation of right (R) and left (L) circularly polarised electromagnetic
waves in the plasma. The laser pulse is allowed to propagate inside the plasma
when its frequency falls in the pass band of the dispersion curves of L and/or
R waves. The strength of the applied external magnetic field is chosen as a
parameter to ensure that the laser frequency lies in the appropriate pass band.
It is demonstrated that for all possible polarization of the incident laser,
parametric process involving a scattered Electromagnetic wave and an
electrostatic mode occur. The parametric process has been identified as that
due to the Brillouin back scattering process.
