Modeling the emission of high power terahertz radiation using Langmuir wave as a wiggler

Abstract

The emission of high power terahertz (THz) radiation lying in the range of millimeter to submillimeter wavelengths has been studied analytically using the Langmuir wave as an electrostatic pump wave in the presence of static magnetic field for both finite and infinite geometries. The interaction of two laser beams with the relativistic electron beam leads to velocity modulation of the beam, which then translates into density modulation on traveling through the drift space. The premodulated beam on interacting with the pump wave acquires an oscillatory velocity that couples with the perturbed and modulated beam densities to result in nonlinear current density which helps in evaluating the growth rate and efficiency of the output THz radiation. The beam and plasma wave wiggler parameters are found to influence the growth rate and efficiency of the emitted THz radiation.

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

“…During the past few decades, the emission of terahertz (THz) radiation has attracted the attention of researchers to explore new models to study its potential for various applications in the field of spectroscopy, biomedical imaging, security analysis, telecommunications [1][2][3][4] etc. Various schemes that involve the use of relativistic electron beam (REB) [5][6][7] and laser beams [8,9] have been employed to study the generation of THz radiation.…”