Shortening X-Ray Pulse Duration via Saturable Absorption
- 15 October 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 127 (16), 163903
- https://doi.org/10.1103/physrevlett.127.163903
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: ) by . 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.
Keywords
Funding Information
- Japan Society for the Promotion of Science (19K20604)
- Japan Synchrotron Radiation Research Institute (2019B8012, 2020A8021)
This publication has 48 references indexed in Scilit:
- X-ray and optical wave mixingNature, 2012
- X-ray free-electron lasersNature Photonics, 2010
- Interference between Compton Scattering and X-Ray Parametric Down-ConversionPhysical Review Letters, 2007
- Fully Coherent X-Ray Pulses from a Regenerative-Amplifier Free-Electron LaserPhysical Review Letters, 2006
- Measurement of X-Ray Pulse Widths by Intensity InterferometryPhysical Review Letters, 2002
- X-ray parametric scattering by a diamond crystalJournal of Synchrotron Radiation, 1998
- Measurement of ultrafast optical pulses with two-photon interferenceOptics Letters, 1993
- Interference effects between independent gamma raysPhysical Review Letters, 1992
- X-Ray Parametric ConversionPhysical Review Letters, 1971
- Reversible Photochemical Processes in Rigid Media. A Study of the Phosphorescent StateJournal of the American Chemical Society, 1941