Combined effect of transverse electric and magnetic fields on THz generation by beating of two amplitude-modulated laser beams in the collisional plasma

Abstract

In this paper, we have provided a theoretical analysis on enhanced terahertz (THz) generation by beating two amplitude-modulated laser beams in the collisional plasma under the effect of static electric and magnetic fields. Two amplitude-modulated laser beams of slightly different frequencies (${\upomega }_{1} , {\upomega }_{2}$) with wavenumbers (${k}_{1} , {k}_{2}$) are propagating along the same direction under the effect of these fields. The coupling between the various nonlinear terms like the nonlinear velocity and electron density in the collisional plasma results in the THz generation. The electric field, magnetic field, and propagation direction of lasers are mutually perpendicular to each other. The applied static magnetic and electric fields assist to enhance the nonlinear current density and normalized THz amplitude. The normalized THz amplitude shows notable enhancement with the increase of applied static electric and magnetic fields. This scheme can be employed to generate and detect the THz radiations for making interesting astronomical observations.