What question did this study set out to answer?

The aim is to demonstrate lasing in a cavity-based X-ray Free Electron Laser (CBXFEL).

March 26, 2026Open Access

Lasing of a cavity-based X-ray source

Key Points

The aim is to demonstrate lasing in a cavity-based X-ray Free Electron Laser (CBXFEL).
Constructed a 133 m round-trip hard X-ray cavity using diamond Bragg crystals.
Performed multi-pass gain measurements in the X-ray cavity.
Conducted experiments at the European XFEL.
Achieved the first lasing with multi-pass gain in an X-ray cavity.
Demonstrated the feasibility of CBXFELs for future applications.
Showed potential for next-generation X-ray sources with enhanced spectral purity and stability.

Abstract

Cavity-based X-ray Free Electron Lasers (CBXFELs) promise to transform thefield of hard X-ray science by delivering laser-like radiation with exceptional bril-liance, stability, and full three-dimensional coherence. At the European XFEL,we have constructed a proof-of-concept CBXFEL featuring a 133 m round-triphard X-ray cavity using diamond Bragg crystals. Here, we report the first las-ing with multi-pass gain in an X-ray cavity, marking a major milestone for thefield. Our results establish the feasibility of CBXFELs and open the door tonext-generation X-ray sources with unprecedented spectral purity and stability.

Lasing of a cavity-based X-ray source

Key Points

Abstract

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