Abstract
This paper investigates the excitation of terahertz radiation (in the form of a magnetosonic wave) by the interaction of the upper hybrid (pump) wave and the extraordinary wave (laser). The ponderomotive force due to the nonlinear interaction between the pump wave and the extraordinary wave (laser) generates a nonlinear current at the difference frequency. If the appropriate phase matching conditions are satisfied and the frequency of the pump is appropriate, then this difference frequency can be brought in the terahertz range. The extraordinary wave propagates perpendicular to the static magnetic field and is polarized perpendicular to the static magnetic field. The expressions for the coupling coefficients of the three-wave interaction have been derived. The analytical expression for the electric vector of the terahertz wave has been obtained. By changing the strength of the magnetic field, one can enhance or suppress the terahertz emission. For the typical laser plasma parameters used here (plasma dens...
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