Terahertz radiation emission using plasma‐filled dielectric liner with the effects of pre‐modulated relativistic electron beam

Abstract

We propose a theoretical model for the efficient emission of high-power terahertz (THz) radiation. The pre-modulation of the beam is accounted for by the interaction of the two laser beams with the relativistic electron beam (REB). The pre-modulated REB travels through a dielectric liner waveguide, which is filled with a plasma. The REB travels near the dielectric lining boundary and therefore transfers maximum energy to the electromagnetic radiation wave via Cerenkov interaction. The growth rate and efficiency of the radiation wave are examined and found to be altered by the parameters of the REB and the dielectric medium. The growth rate varies as one-third power of the beam density and as two-thirds power of the amplitude of the pump wave field. The proposed scheme seems to be an effective method for the generation of tunable THz radiation.