论文标题
由表面电子产生的高效terahertz辐射是由激光束相互作用产生的
Highly-efficient terahertz radiation generated by surface electrons from laser-foil interactions
论文作者
论文摘要
提出了一种基于激光 - 固定相互作用的强大的Terahertz（THZ）辐射的新型方案。当$ p $偏振的飞秒激光倾斜地撞击平面固体靶标，而靶标会部分阻断激光能时，表面电子被提取并通过激光场加速，形成低差异电子束。由于连贯的衍射辐射，当梁通过目标边缘时，半循环THZ辐射脉冲同时发出。我们的粒子中的模拟表明，相对论的THZ脉冲可以具有数十毫米的能量，并且使用现有$ \ sim $ j级$ j级别的激光源的转换效率可以超过1 $ \％$。
A novel scheme for generating powerful terahertz (THz) radiation based on laser-solid interactions is proposed. When a $p$-polarized femtosecond laser impinges obliquely on a plane solid target and the target partially blocks the laser energy, surface electrons are extracted out and accelerated by the laser fields, forming a low-divergence electron beam. A half-cycle THz radiation pulse is emitted simultaneously as the beam passes by the edge of the target, due to coherent diffraction radiation. Our particle-in-cell simulations show that the relativistic THz pulse can have an energy of a few tens of millijoule and the conversion efficiency can be over 1$\%$ with existing $\sim$J level femtosecond laser sources.
