Generation of THz waves through interaction of the wakefield of two-color laser pulses with magnetized plasma

TL;DR

This paper investigates how two-color laser pulses interacting with magnetized plasma can generate THz radiation, analyzing the effects of various parameters on the radiation patterns in different interaction regimes.

Contribution

It introduces a detailed analysis of THz wave generation via wakefield interactions in magnetized plasma, considering relativistic and non-relativistic regimes with parameter variations.

Findings

Wakefield and forward wave generation depend on laser and plasma parameters.

Relativistic effects influence the interaction dynamics and radiation patterns.

Spatial laser profile and magnetic field affect the directionality of emitted THz waves.

Abstract

The present study explores radiation in THz spectrum region through the interaction of the wakefield of two-color laser pulses with magnetized plasma. The interaction of the two-color laser with plasma electrons induces transverse nonlinear current in two dimensions, resulting in generation of a wakefield and a forward wave. The investigation revealed that during the non-relativistic regime of laser-plasma interaction, interdependence exists between the electric fields of the forward wave and the wake. Conversely, in the relativistic regime, the dynamic of interaction changes, and plasma electrons are influenced not only by the electric field of the laser pulse but also by relativistic effects like Lorentz contraction, responding to both the electric and magnetic field components. This leads to generation of wake and forward wave radiations. The interplay between various laser and plasma parameters is analyzed, shedding light on the conditions leading to radiation angular distribution patterns in the forward and backward directions. The impact of spatial laser profile, a DC external magnetic field, polarization states, and plasma interaction length on the generated wake and forward wave patterns has been investigated. Through systematic variation of these parameters, the objective is to elucidate the controlled directional features of the resulting fields and radiation patterns.