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Updated: May 21, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Extreme-ultraviolet compact spectrometer for the characterization of the harmonics content in the free-electron-laser
Fabio Frassetto1, Stefano Coraggia, Siarhei Dziarzhytski
1Institute of Photonics and Nanotechnologies, National Research Council of Italy, via Trasea 7, Padova 35131, Italy. frassett@dei.unipd.it
Abstract:
The design and the commissioning results of a portable and compact spectrometer for the high harmonics content characterization of the extreme-ultraviolet radiation of FLASH (free-electron laser in DESY, Hamburg, Germany) are presented. The instrument is a grazing-incidence flat-field spectrometer equipped with two variable-line-spaced gratings; it covers the 2-40 nm wavelength region with a spectral resolution in the 0.1-0.2% range. Both spectral and intensity fluctuations of the fundamental emission and the harmonics are monitored.
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