Open AccessExtreme‐ultraviolet compact spectrometer for the characterization of the harmonics content in the free‐electron‐laser radiation at FLASH
Author(s) -
Frassetto Fabio,
Coraggia Stefano,
Dziarzhytski Siarhei,
Gerasimova Natalia,
Poletto Luca
Publication year - 2012
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049512022224
Subject(s) - extreme ultraviolet , desy , spectrometer , optics , harmonics , laser , flash (photography) , spectral resolution , free electron laser , radiation , physics , wavelength , materials science , optoelectronics , spectral line , astronomy , quantum mechanics , voltage
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.