Abstract
Free-electron lasers (FELs) operating in the extreme ultraviolet region are unique laser sources giving access, for the first time, to the exploration of nonlinear processes in this spectral range [1]. Recently, the first seeded FEL user facility FERMI@Elettra came into operation [2]. The use of an external seed laser to initiate the FEL process ensures unprecedented shot-to-shot wavelength stability, low intensity fluctuations, pulse durations close to the transform-limited bandwidth and transverse and longitudinal coherence. Typical FEL pulses at Fermi are characterized by a single Gaussian mode spectrum with a bandwidth of about 20 meV. The photon energy is tunable from 19 to 62 eV, the pulse energy from few µJ up to 100 µJ and the pulse duration is shorter than 150 fs. These properties make FERMI@Elettra a unique source for the investigation of resonant processes in atomic and molecular systems. We will present a short overview of the characteristics of FERMI in terms of intensity stability and spectral resolution. As single-shot information about the XUV beam (energy and spectral distribution) can be acquired, post-processing allows one to to investigate the intensity and wavelenght dependence of linear and nonlinear processes.
© 2013 Optical Society of America
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