Miltcho B. Danailov

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: Bencivenga et al. as discussed by the authors showed how to stimulate four-wave mixing processes at sub-optical wavelengths using the FERMI free-electron laser as a source to generate extreme ultraviolet pulses that produce transient gratings.

TL;DR: The generation of two-colour extreme ultraviolet pulses of controlled wavelengths, intensity and timing by seeding of high-gain harmonic generation free-electron laser with multiple independent laser pulses is reported.

TL;DR: In this article, the authors report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods.