Shortening X-Ray Pulse Duration via Saturable Absorption.
Phys Rev Lett
; 127(16): 163903, 2021 Oct 15.
Article
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| MEDLINE
| ID: mdl-34723578
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 2.0-3.5×10^{5} J/cm^{2}) by â¼35%. 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.
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