Terahertz radiation generation and shape control by interaction of array Gaussian laser beams with plasma

Abstract

In the present paper, a scheme for generation of terahertz (THz) radiation in electron-neutral collisional plasma based on beating of two Gaussian laser array beams has been proposed. It is shown that the efficiency of THz radiation based on the Gaussian laser array beams can be enhanced drastically in comparison with the efficiency of THz radiation based on the Gaussian one. Furthermore, the producing THz radiation by the Gaussian laser array beams, which has an exclusive field profile, is affected by some array structure parameters. It can also be used to overcome the negative consequences of electron neutral collisions in plasma, which may be occurring in the THz radiation generation process. Optimizing the collisional plasma, laser beams and array structure parameters, THz radiation efficiency up to 0.07% can be obtained in our scheme which is about three times greater than the maximum efficiency obtained for standard (single) Gaussian laser beam. Also, considering the electrostatic energy channel in solving the THz wave equation, and reduction of THz radiation efficiency to 0.054%, in this assumption, the ratio between the efficiency of Gaussian laser array beams and standard Gaussian laser beam remained unchanged.

Studies of Terahertz Sources and Their Applications

“…Bakhtiari et al [116] proposed a scheme for improving terahertz radiation efficiency by the interaction of two Gaussian laser array beams in an electron-neutral collisional plasma. They optimized that high efficiency of up to 0.07% can be achieved using array beams, which is almost three times higher than the maximum efficiency achieved by a single Gaussian laser beam.…”

The influence of static magnetic field on nonlinear response of a plasma background in the presence of two laser beams with different profiles (Hermite– and Laguerre–Gaussian)

“…These anisotropic phenomena can influence and also tune the electric field profile of EM waves propagating in an optically active medium. Nowadays, a large number of studies have been devoted to the harmonic generation in optically active media by nonlinear interaction of laser beams of different profiles [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Theoretical and experimental evidence indicates that the spatial profile of the laser beam plays a pivotal role in the electric field amplitude of generated radiation [16][17][18][19][20][21][22][23][24][25][26][27].…”

“…Nowadays, a large number of studies have been devoted to the harmonic generation in optically active media by nonlinear interaction of laser beams of different profiles [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Theoretical and experimental evidence indicates that the spatial profile of the laser beam plays a pivotal role in the electric field amplitude of generated radiation [16][17][18][19][20][21][22][23][24][25][26][27]. The nonlinear material properties are another important factor to consider in the new harmonic generation by intense laser-particle interaction [27][28][29][30][31][32][33].…”

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

“…The emission of THz radiation by beating two Gaussian pulsed laser beams in a rippled plasma with neutral-electron collision has been proposed by Bakhtiari et al [10] They observed that by optimizing the parameters of the laser beams, the collisional plasma, and the array structure, the efficiency of the radiation is enhanced to a considerable amount.…”