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Updated: Jan 9, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Laser-driven high-flux source of coherent quasi-monochromatic extreme ultraviolet radiation for coincidence
Julian Späthe1, Sebastian Hell1, Martin Wünsche1,2,3
1Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, 07743 Jena, Germany.
Abstract:
We present a source of coherent extreme ultraviolet (XUV) radiation with a flux of 1013 photons per second at 26.5 eV. The source is based on high-harmonic generation in argon and pumped by a frequency-doubled 100 kHz repetition rate fiber laser providing 30 fs pulses centered at 515 nm. We report on the characterization of the source and the generated XUV radiation using optical imaging and photoelectron spectroscopy. The generated radiation is quasi-monochromatized using a suitably coated XUV mirror and used for coincidence spectroscopy of ions and electrons generated from a cold gas target. The high intensity of the focused XUV pulses is confirmed by the observation of two-photon double ionization in argon. Moreover, we demonstrate the capability to perform pump-probe experiments using XUV and visible laser pulses.
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