论文标题
高阶谐波产生的协同纵向加速和横向振荡
Synergistic Longitudinal Acceleration and Transverse Oscillation in High-order Harmonic Generation
论文作者
论文摘要
我们提出并证明，具有缓慢腐烂的功率定律的相对论谐波是由平行于微尺度过度密度等离子体平行的飞秒的lase脉冲入射而产生的。结果表明，由于强烈的表面波的激发，在横向激光场中振荡时，致密的电子纳米置持续向前加速。即使在固定相位点上，纳米纯的相对论伽马因子也大大增加，与恒定伽玛的情况相比，纳米纯的伽马因子也会大大增加。我们的二维粒子中的模拟和分析理论表明，该协同函数承诺幂律谐波频谱$ i_n/i_0 = n^{ - 1} $。这比其他众所周知的辐射机制更为平坦，并为前所未有的大能量脉冲铺平了道路。
We propose and demonstrate that relativistic harmonics with a slowly decaying power law are generated from a femtosecond lase pulse incident parallel to a micro-scale overdense plasma. It is shown that due to the excitation of a strong surface wave, dense electron nanobunches are continuously accelerated forward while oscillating in the transverse laser field. Even around the stationary phase point, relativistic gamma factors of the nanobunches increase considerably, leading to a much stronger attosecond burst, compared to the case with constant gamma. Our two-dimensional particle-in-cell simulations and analytical theory show that this synergistic function promises a power-law harmonic spectrum $I_n/I_0 = n^{-1}$. This is much flatter than the other well-known radiation mechanisms and paves the way to unprecedentedly large energy attosecond pulses.
