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arXiv 2009.12918physics.plasm-ph
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高次谐波产生中的纵向加速度与横向振荡的协同效应

Synergistic Longitudinal Acceleration and Transverse Oscillation in High-order Harmonic Generation

X. F. Shen, A. Pukhov, B. Qiao

摘要:

我们提出并证明了飞秒激光脉冲平行入射到微尺度过密等离子体中产生了具有缓慢衰减幂律的相对论谐波。结果表明,由于强表面波的激发,密集的电子纳米束在横向激光场中振荡的同时不断向前加速。即使在固定相位点附近,纳米束的相对论伽马因子也会显著增加,导致比恒定伽马的情况更强的阿秒爆发。我们的二维粒子模拟和分析理论表明,这种协同功能承诺的幂律谐波频谱$I_n/I_0 = n^{-1}$。这比其他众所周知的辐射机制要平坦得多,为前所未有的大能量阿秒脉冲铺平了道路。

英文摘要:

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.

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