Resonant terahertz radiation from warm collisional inhomogeneous plasma irradiated by two Gaussian laser beams

被引：22

作者：

Niknam, A. R. ^{[1
]}

Banjafar, M. R. ^{[1
]}

Jahangiri, F. ^{[1
]}

Barzegar, S. ^{[1
]}

Massudi, R. ^{[1
]}

机构：

[1] Shahid Beheshti Univ, Laser & Plasma Res Inst, Tehran, Iran

来源：

PHYSICS OF PLASMAS | 2016年 / 23卷 / 05期

关键词：

OPTICAL RECTIFICATION; THZ EMISSION; GENERATION; PULSES;

D O I：

10.1063/1.4949344

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Terahertz (THz) radiation generation by the interaction of two co-propagating high intensity laser beams with a warm collisional inhomogeneous plasma is analytically investigated. By presenting the dielectric permittivity of plasma and taking into account the ponderomotive force, the nonlinear current at THz frequency is obtained. A secondary resonant enhancement of THz radiation is observed, in addition to that occurs at the plasma frequency, which can be tuned by plasma density and temperature. Moreover, we show that for each beat frequency, there exists an optimum temperature at which THz radiation is maximized. It is also shown that the power and efficiency of THz radiation decrease by increasing the collision frequency. Published by AIP Publishing.

引用

页数：5

共 34 条

[1] Excitation of terahertz radiation by laser pulses in nonuniform plasma channels [J].