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Updated: Jun 16, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Longitudinal coherence measurements of an extreme-ultraviolet free-electron laser
W F Schlotter1, F Sorgenfrei, T Beeck
1Institute for Experimental Physics, University of Hamburg and Center for Free Electron Laser Science,22761 Hamburg, Germany. william.schlotter@desy.de
Abstract:
We have measured the average single-pulse longitudinal coherence characteristics of FLASH, a self amplified spontaneous emission free electron laser, at extreme UV wavelengths. Electric field autocorrelation measurements in the time domain were enabled by a wavefront division beam splitter applied to a tunable delay Mach-Zehnder interferometer. These data agree with the spectral bandwidth measurements made in the frequency domain. They exhibit two correlation time scales and the measured coherence curves have relevant implications for single-shot measurements.
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