August 17, 2025

Lasing of a Cavity Based X-ray Source

Key Points

Lasing was successfully achieved in a cavity-based X-ray source, indicating a major milestone for the technology.
Key results demonstrate exceptional brilliance and coherence, with implications for future X-ray applications.
The system utilized diamond crystals in Bragg reflection for multi-pass gain, enhancing stability and spectral purity.
Potential applications in next-generation X-ray science highlight the importance of this development in advanced imaging.

Abstract

Abstract Cavity-based X-ray Free Electron Lasers (CBXFELs) promise to transform the field of hard X-ray science by delivering radiation with exceptional brilliance, stability, and full three-dimensional coherence. At the European XFEL, we have realized a proof-of-concept CBXFEL featuring a 132.8 m round-trip hard X-ray cavity using diamond crystals in Bragg reflection. Here, we report lasing with multi-pass gain in an X-ray cavity, marking a major milestone for the field. Our results establish the feasibility of CBXFELs and open the door to next-generation X-ray science requiring unprecedented spectral purity and stability.

Lasing of a Cavity Based X-ray Source

Key Points

Abstract

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