Polarization-tunable terahertz (THz) radiation in pair plasma has been generated under the combined configuration of helical wiggler and solenoidal magnetic fields. The control over electromagnetic vector of the emitted field (i.e. polarization) furnishes the knob of another degree of freedom which is very useful in numerous applications. With the optimization of wiggler period and frequency, the total angular spread of the field has been reduced which provides a narrow-band THz spectrum. Additionally, the solenoidal field not only prevents the escape of particles during laser-matter interaction but also enhances the magnitude of emitted field. Along with the external magnetic field, collisions among the particles and ripples in plasma density have also been considered to fine-tune the radiation.

中文翻译：

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控制对等离子体中太赫兹辐射的极化

在螺旋摆动器和螺线管磁场的组合配置下，已在对等离子体中产生偏振可调太赫兹 (THz) 辐射。对发射场的电磁矢量（即极化）的控制提供了另一个自由度的旋钮，这在许多应用中非常有用。随着摆动周期和频率的优化，场的总角展已减小，从而提供了窄带太赫兹频谱。此外，螺线管场不仅可以防止粒子在激光与物质相互作用过程中逃逸，还可以增强发射场的大小。除了外部磁场，粒子之间的碰撞和等离子体密度的波动也被认为是微调辐射。