Harmonic generation by femtosecond laser-solid interaction: A coherent ''water-window'' light source?
Harmonic generation by femtosecond laser-solid interaction: A coherent ''water-window'' light source?
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DOI：
10.1103/physrevlett.76.50
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发表时间：
1996-01-01
影响因子：
8.6
通讯作者：
Gibbon, P
中科院分区：
文献类型：
--
作者：
Gibbon, P
利用粒子模拟方法研究了强激光脉冲从固体密度等离子体中反射产生谐波的过程。高辐照度、倾斜入射的p偏振光通过拖拽穿过真空-固体界面的相对论电子产生谐波。这种机制没有表现出先前预测的最大谐波“截止"n（max）= omega（p）/omega（0）的较低强度的限制。当I λ（2）> 10（19）W cm（-2）μ m（2）和适度的架密度N-e/N-crit = 10时，至少可以产生60个谐波，功率效率P-n/P-1 > 10（-6），这表明用KrF（248 nm）泵浦可以产生λ近似于4 nm的相干MW x射线。
The generation of harmonics by short, intense laser pulses reflected from a solid-density plasma is investigated using particle-in-cell simulation. High irradiance, obliquely incident p-polarized light generates harmonics via relativistic electrons dragged across the vacuum-solid interface. This mechanism does not exhibit the limitation previously predicted for lower intensities of a maximum harmonic ''cutoff'' n(max) = omega(p)/omega(0). For I lambda(2) > 10(19) W cm(-2) mu m(2) and modest shelf densities N-e/N-crit = 10, at least 60 harmonics can be generated with power efficiencies P-n/P-1 > 10(-6), suggesting coherent MW x rays with lambda similar to 4 nm could be generated with a KrF (248 nm) pump.