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Updated: Jan 22, 2026

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Demonstration of Mode-Locked Frequency Comb for an X-Ray Free-Electron Laser

Wenxiang Hu1,2, Gabriel Aeppli1,2,3, Christopher Arrell1

  • 1Paul Scherrer Institute, PSI Center for Photon Science, 5232 Villigen PSI, Switzerland.

Physical Review Letters
|January 20, 2026
PubMed
Summary

Researchers demonstrated mode-locked self-amplified spontaneous emission (SASE) for X-ray Free-Electron Lasers (FELs). This breakthrough generates phase-locked X-ray pulses, advancing coherent spectroscopy and ultrafast dynamics studies.

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