Bertram Friedrich

The X-ray free-electron laser oscillator at the European XFEL: design and status

Bertram Friedrich, Benoit Rio, Daniele La Civita, Immo Bahns et autres

This contribution provides an insight into the X-ray Free Electron Laser Oscillator (XFELO), an R&D project currently under commissioning at the European XFEL. XFELO aims to be the first demonstrator of a cavity-based free electron laser, promising significantly enhanced beam properties. The …

Lasing of a cavity-based X-ray source

Patrick Rauer, Immo Bahns, Bertram Friedrich, S. Casalbuoni et autres

Abstract The invention of the laser transformed optics by providing intense, coherent light in the visible region, but extending this concept to X-rays has been hindered by a lack of suitable gain media and mirrors. Current hard X-ray free-electron laser (XFEL) facilities …

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Lasing of a cavity-based X-ray source

Patrick Rauer, Immo Bahns, Bertram Friedrich, S. Casalbuoni et autres

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 …

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Metrology on KB mirrors for an x-ray free electron laser oscillator

Silja Schmidtchen, Bertram Friedrich, Idoia Freijo Martìn, Daniele La Civita et autres

The European XFEL is a large x-ray free-electron laser facility in the Hamburg area of Germany, designed to provide a transversally fully coherent x-ray radiation with outstanding characteristics, such as high repetition rate, ultra-short wavelength (down to 0.05 nm), short pulses in …

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Lasing of a Cavity Based X-ray Source

Patrick Rauer, Immo Bahns, Bertram Friedrich, S. Casalbuoni et autres

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Imaging via Correlation of X-Ray Fluorescence Photons

F. Trost, Kartik Ayyer, Mauro Prasciolu, Holger Fleckenstein et autres

We demonstrate that x-ray fluorescence emission, which cannot maintain a stationary interference pattern, can be used to obtain images of structures by recording photon-photon correlations in the manner of the stellar intensity interferometry of Hanbury Brown and Twiss. This is achieved utilizing …

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