Generation of wakefields and terahertz radiation in laser-magnetized plasma interaction

Abstract

Analytical study of terahertz (THz) radiation generation due to wakefields produced by propagation of short laser pulses in magnetized, homogeneous plasma, in the mildly relativistic regime has been presented. The uniform magnetic field is applied along a direction perpendicular to the electric vector as well as the propagation direction of the laser field. A perturbative technique is used to obtain electric and magnetic wakefields generated within and behind the laser pulse. It is seen that the coupling of the slow velocities with the transverse magnetic field leads to on-axis THz radiation generation.

THz radiation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma

“…Currently, the powerful sources of THz radiation are large accelerator-based sources and the lack of compact high-power sources limits the exploitation of full potential of THz radiation. For the development of practical high-power THz sources, schemes based on laser-plasma interaction have been proposed (Hamster et al, 1993;Yugami et al, 2002;Gildenburg & Vvedenskii, 2007;Sharma et al, 2010;Jha et al, 2011;. Filamentation (phenomena of periodic self-focusing and defocusing) is another process from which THz can be generated.…”

Laser wakefield acceleration in magnetized plasma

“…Many interesting phenomena arise when an intense laser pulse propagates in magnetized plasma [16][17][18]. The effect of an external magnetic field on the generation of transverse wakefields, in the weakly relativistic limit, has been reported [19,20].…”

Strong Terahertz radiation generation via wakefield in collisional plasma

“…As is clear from the above work that the lasers have been used to excite wakefield in plasmas [12,14,23,26,30,33,35,36] and this field has been found to be tailored based on the shapes of the laser / microwave pulses [39][40][41][42]. In the present work, we show that the application of an external magnetic field can generate a transverse component of the wakefield which serves as the THz radiation source and we can tune the radiation by the use of super-Gaussian lasers.…”

“…The researchers all over the world are putting their efforts to generate the THz radiation sources where the laser plasma interaction has vital role to play. There are a lot of studies on laser plasma interaction, which talk about different mechanisms [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Extremely powerful THz radiations have been achieved by interaction of chirped [24], few cycle laser pulses [25] and tailored laser pulses [26] with plasmas.…”