Compression of X-ray Free Electron Laser Pulses to Attosecond Duration.
Compression of X-ray Free Electron Laser Pulses to Attosecond Duration.
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DOI：
10.1038/srep16755
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发表时间：
2015-11-16
影响因子：
4.6
通讯作者：
Norreys PA
中科院分区：
文献类型：
--
作者：
Sadler JD;Nathvani R;Oleśkiewicz P;Ceurvorst LA;Ratan N;Kasim MF;Trines RM;Bingham R;Norreys PA
最先进的x射线自由电子激光设备目前提供最亮的x射线脉冲，通常具有mJ能量和数百飞秒持续时间。在这里，我们展示了一维和二维的细胞内粒子模拟，利用受激拉曼放大过程，表明这些脉冲被压缩成一个时间相干的、亚飞秒的脉冲，效率为8%。这种类型的脉冲可能为电子在纳米尺寸电位的常规时间分辨铺平道路。此外，有证据表明，显著的朗道阻尼和破波可能有利于扭曲相互作用的后部，并进一步缩短最终脉冲持续时间。
State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration. Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency. Pulses of this type may pave the way for routine time resolution of electrons in nm size potentials. Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.