Extreme-ultraviolet compact spectrometer for the characterization of the harmonics content in the free-electron-laser radiation at FLASH.
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.
Institute of Photonics and Nanotechnologies, National Research Council of Italy, via Trasea 7, Padova 35131, Italy. frassett@dei.unipd.it
Fabio
F
Frassetto
Stefano
S
Coraggia
Siarhei
S
Dziarzhytski
Natalia
N
Gerasimova
Luca
L
Poletto