Advances in Attosecond Inner-Shell X-ray Laser Science

ORAL  · Invited

Abstract

We present our progress in exploring the phenomenon of stimulated x-ray emission spectroscopy (S-XES) based on inner-shell lasing at 6 – 8 keV as a new spectroscopy tool, and as a new source of ultrafast hard X-ray pulses. We first discuss the principle of S-XES, and the experimental methods required for generating and measuring it. We then discuss recent results for spectroscopy applications of S-XES and its potential and challenges of providing enhanced electronic structure sensitivity. We then discuss applications of S-XES as a powerful new x-ray source for probing attosecond dynamics. Here we present the observation of strong lasing effects and a new technique, X-ray coherent attosecond pulse pair spectroscopy (X-CAPPS) enabling interferometry for probing phenomena in the 500 attosecond to 5 femtosecond time window.

*This work is supported by the US Department of Energy (DOE) Office of Basic Energy Sciences (OBES), Division of Chemical Sciences, Geosciences and Biosciences (CSGB) under contract no. DE-SC0023270. The use of Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) DE-AC02-76SF00515. The experiment at SACLA was performed with the approval of the Japan Synchrotron Radiation Research Institute (proposal nos. 2017B8066 and 2024A8055) and funding from JPSJ KAKENHI for grant nos. 19K20604, 22KK0233, 23K25131, 24K21199, and 22K1813.

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Publication: Abhari et al, X-ray Coherent Attosecond Pulse Pair Spectroscopy, to be submitted
Kroll et al, Observation of Multiplet Lines in Seeded Stimulated Mn Kα1 X-ray Emission, arXiv:2503.03993v1
Linker et al, Attosecond inner-shell lasing at ångström wavelengths, Nature 642, 934–940 (2025)
Doyle et al, Seeded stimulated X-ray emission at 5.9 keV, Optica 10, 513-519 (2023)
Zhang et al, Generation of Intense Phase-Stable Femtosecond Hard X-ray Pulse Pairs, Proc Natl Acad Sci 119, e2119616119 (2022)

Presenters

  • Uwe Bergmann

    • University of Wisconsin - Madison

Authors

  • Uwe Bergmann

    • University of Wisconsin - Madison