Shortening X-Ray Pulse Duration via Saturable Absorption
Shortening X-Ray Pulse Duration via Saturable Absorption
复制标题
DOI：
10.1103/physrevlett.127.163903
复制
发表时间：
2021-10-15
影响因子：
8.6
通讯作者：
Yabashi, Makina
中科院分区：
文献类型：
--
作者：
Inoue, Ichiro;Inubushi, Yuichi;Yabashi, Makina
为了缩短 X 射线脉冲的持续时间，我们提出了一种非线性光学技术，使用由内壳光电离产生的具有核孔空位的原子（核孔原子）。核孔原子中的弱库仑屏蔽导致紧邻吸收边缘上方的光子能量的吸收减少。通过利用这种称为饱和吸收的现象，我们成功地将 X 射线自由电子激光脉冲的持续时间（光子能量：9.000 keV，持续时间：6-7 fs，注量：2.0-3.5 x 10(5) J/cm(2)）减少了大约 35%。芯孔原子适用于非线性 X 射线光学的这一发现是将光学波长下常见的非线性技术扩展到硬 X 射线区域的重要垫脚石。
To shorten the duration of x-ray pulses, we present a nonlinear optical technique using atoms with core-hole vacancies (core-hole atoms) generated by inner-shell photoionization. The weak Coulomb screening in the core-hole atoms results in decreased absorption at photon energies immediately above the absorption edge. By employing this phenomenon, referred to as saturable absorption, we successfully reduce the duration of x-ray free-electron laser pulses (photon energy: 9.000 keV, duration: 6-7 fs, fluence: 2.0-3.5 x 10(5) J/cm(2)) by similar to 35%. This finding that core-hole atoms are applicable to nonlinear x-ray optics is an essential stepping stone for extending nonlinear technologies commonplace at optical wavelengths to the hard x-ray region.