论文标题
从激光相互作用与微质量波导的多中微型Terahertz辐射
Multimillijoule terahertz radiation from laser interactions with microplasma-waveguides
论文作者
论文摘要
当相对论，飞秒激光脉冲进入波导时，脉冲能将耦合到波导光学模式中。纵向激光场有效地沿通道轴加速了电子，而不对称的横向电磁场倾向于将快速电子径向排出。 At the exit of the waveguide, the $\sim$${\rm nC}$, $\sim$$10\ {\rm MeV}$ electron bunch converts its energy to a $\sim$$10\ {\rm mJ}$ terahertz (THz) laser pulse through coherent diffraction radiation.在本文中，我们提出了上述相互作用过程的3D粒子中的模拟和理论分析。我们研究了快速电子的纵向加速度和径向驱动的过程，以及所得THZ辐射对激光和等离子体参数的性质的依赖性以及前肿瘤的影响。模拟结果表明，如果波导长度最佳并且使用高对比度泵激光器，能量的转换效率可能超过$ 5 \％$。这些结果指导了更强烈和强大的THZ来源的设计。
When a relativistic, femtosecond laser pulse enters a waveguide, the pulse energy is coupled into waveguide optical modes. The longitudinal laser field effectively accelerates electrons along the axis of the channel, while the asymmetric transverse electromagnetic fields tend to expel fast electrons radially outwards. At the exit of the waveguide, the $\sim$${\rm nC}$, $\sim$$10\ {\rm MeV}$ electron bunch converts its energy to a $\sim$$10\ {\rm mJ}$ terahertz (THz) laser pulse through coherent diffraction radiation. In this paper, we present 3D particle-in-cell simulations and theoretical analyses of the aforementioned interaction process. We investigate the process of longitudinal acceleration and radial expulsion of fast electrons, as well as the dependence of the properties of the resulting THz radiation on laser and plasma parameters and the effects of the preplasma. The simulation results indicate that the conversion efficiency of energy can be over $5\%$ if the waveguide length is optimal and a high contrast pump laser is used. These results guide the design of more intense and powerful THz sources.
