Shortening X-Ray Pulse Duration via Saturable Absorption

被引：13
|
作者：
Inoue, Ichiro [1 ]
Inubushi, Yuichi [1 ,2 ]
Osaka, Taito [1 ]
Yamada, Jumpei [1 ]
Tamasaku, Kenji [1 ]
Yoneda, Hitoki [3 ]
Yabashi, Makina [1 ,2 ]
机构：
[1] RIKEN, SPring 8 Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan
[2] Japan Synchrotron Radiat Res Inst, Kouto 1-1-1, Sayo, Hyogo 6795198, Japan
[3] Univ Electrocommun, Chofugaoka 1-5-1, Chofu, Tokyo 1828585, Japan
来源：
PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 16期
基金：
日本学术振兴会;
关键词：
LASER; SINGLE;
D O I：
10.1103/PhysRevLett.127.163903
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页数：6
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