The electron density singularity formed at the joining area of relativistic wake wave and bow waves has been proposed as a novel relativistic electron mirror regime to reflect the counter-propagating electromagnetic pulse [1]. Coherent hard electromagnetic radiation is generated by the reflection, compression and frequency upshift from the electron density singularity. In this paper, detailed description of this regime is provided, and new features are shown. The electromagnetic fields reflected by the electron density singularity are investigated via multi-dimensional particle-in-cell simulations.

中文翻译：

---

激光等离子体中弓形波形成的激光辐照电子密度奇异性引起的高次谐波

已经提出了在相对论尾波和弓形波的结合区域形成的电子密度奇异性，作为反映相对传播电磁脉冲的新型相对论电子镜方案[1]。相干的硬电磁辐射是由电子密度奇异性的反射，压缩和频率上移产生的。在本文中，提供了对该机制的详细描述，并显示了新功能。通过多维粒子内模拟研究了由电子密度奇异性反映的电磁场。