This paper presents an analytical and simulation study of terahertz (THz) radiation generation using short, circularly polarized laser pulses propagating in plasma embedded in arbitrarily oriented magnetic field. Perturbation technique is used to obtain generated electric and magnetic wakefields within and behind the laser pulse. Coupling of components of the obliquely applied magnetic field with transverse and axial plasma electron velocities leads to the generation of linearly as well as elliptically polarized transverse electromagnetic radiation oscillating at THz frequency, under appropriate conditions. The amplitude of these fields and ellipticity of the elliptically polarized THz radiation can be varied with the help of the obliqueness of the external magnetic field. Analytical results are validated using VSim PIC simulation code.

本文介绍了使用短的圆偏振激光脉冲在嵌入任意定向磁场的等离子体中传播的太赫兹 (THz) 辐射生成的分析和模拟研究。微扰技术用于获得在激光脉冲内部和后面产生的电磁尾场。在适当的条件下，倾斜施加的磁场的分量与横向和轴向等离子体电子速度的耦合导致在太赫兹频率振荡的线性和椭圆偏振横向电磁辐射的产生。借助外部磁场的倾斜度，可以改变这些场的幅度和椭圆极化太赫兹辐射的椭圆度。使用 VSim PIC 仿真代码验证分析结果。