Giulio Gaio

TL;DR: In this paper, the FERMI free-electron laser operating in the high-gain harmonic generation regime was demonstrated, allowing high stability, transverse and longitudinal coherence and polarization control.

TL;DR: In this paper, a seeded free-electron laser with a two-stage harmonic upshift configuration provided tunable and coherent soft-X-ray pulses with energies of tens of microjoules and a low pulse-to-pulse wavelength jitter at wavelengths of 10.8 nm and below.

TL;DR: In this article, the echo-enabled harmonic generation (EEHG) configuration was used to generate stable, intense, nearly fully coherent pulses at wavelengths as short as 5.9 nm.

TL;DR: In this paper, the results of the FERMI laser heater commissioning are presented, showing that optimizing the electron beam heating at an upstream location leads to a reduction of the incoherent energy spread at the linac exit (beam energy, 1.2 GeV).

TL;DR: EUV transient grating spectroscopy is described, in which two crossed femtosecond EUV pulses produce spatially periodic nanoscale excitations in the sample and their dynamics is probed via diffraction of a third time-delayed EUV pulse.