论文标题
由于激光韦克菲尔德的非线性相互作用引起的电磁发射，在等离子体上碰撞
Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle
论文作者
论文摘要
最近发现，激光诱导的血浆韦克菲尔德的碰撞具有不同的静电电势轮廓，是在等离子体频率的第二个谐波下产生高功率电磁发射的有效机制[i.v.timofeeve.timofeev等。物理。等离子体24，103106（2017）]。这种机制对于在Terahertz频率范围内创建可调窄带相干辐射的来源很有吸引力。在本文中，我们概括了通过两个等离子体唤醒的非线性相互作用产生的电磁发射理论，即任意碰撞角度。这种理论用于评估第二个谐波辐射的角度分布及其在原始实验的参数的总发电效率，在该参数中，激光轴将与小有限角度对齐。理论预测是通过粒子中的模拟来定性确认的。
Head-on collision of laser-induced plasma wakefields with differing profiles of electrostatic potential has been recently found to be an efficient mechanism for generating high-power electromagnetic emission at the second harmonic of the plasma frequency [I.V.Timofeev et al. Phys. Plasmas 24, 103106 (2017)]. This mechanism is attractive for creating a source of tunable narrow-band coherent radiation in the terahertz frequency range. In this paper, we generalize the theory of electromagnetic emission produced by nonlinear interaction of two plasma wakes to the case of an arbitrary collision angle. Such a theory is used to evaluate the angular distribution of the second harmonic radiation as well as its total generation efficiency for parameters of the proof-of-principle experiment in which laser axes will be aligned with a small finite angle. Theoretical predictions are qualitatively confirmed by particle-in-cell simulations.
