Shortening X-ray Pulse Duration via Saturable Absorption
Optics
2021-10-27 v2 Atomic Physics
Abstract
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: 2.0-3.510 J/cm) by 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.
Cite
@article{arxiv.2103.01510,
title = {Shortening X-ray Pulse Duration via Saturable Absorption},
author = {Ichiro Inoue and Yuichi Inubushi and Taito Osaka and Jumpei Yamada and Kenji Tamasaku and Hitoki Yoneda and Makina Yabashi},
journal= {arXiv preprint arXiv:2103.01510},
year = {2021}
}