FERMI (Free Electron laser Radiation for Multidisciplinary Investigations) is a single pass FEL lightsource at Elettra – Sincrotrone Trieste. An international user facility for scientific investigations in Italy, FERMI is one of the major FEL projects in Europe. Unique among the FEL sources currently operating in the ultraviolet and soft x-ray range worldwide, FERMI has been developed with a peak brightness ten billion times higher than at third-generation light sources.
FERMI implements a seeded FEL scheme, improving the output pulse coherence, central wavelength control and spectral bandwidth. The FEL output on the two undulator lines (FEL-1, FEL-2) is tunable in power, wavelength, temporal duration, and polarization. FERMI guarantees the generation of high transversely and longitudinally coherent ultrashort (10-100 femtosecond) pulses in the wavelength range from 100 nm to 4 nm in the first harmonic, with polarization from completely linear both horizontally and vertically to circular in both directions.

  • The seed laser provides a reference signal throughout the FERMI facility to facilitate the femtosecond level precision timing and synchronization of all systems.
  • Two advanced light sources, the electron storage ring Elettra and the free-electron laser (FEL) FERMI are part of the Elettra Laboratory.

Latest News FERMI


Italy, Trieste
Energy: 1.5 GeV
Beamlines: 6
Horizontal emittance: 340 pm rad
Vertical emittance: 340 pm rad

Call for proposals

Access to FERMI beamlines is provided to scientists on the basis of the proposal scientific merit. Elettra Sincrotrone Trieste has appointed an independent, external Proposal Review Panel (PRP), composed of experts in various fields of FEL research and applications.
The next Call is foreseen in the second semester of 2018.
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View FERMI on wayforlight.eu
The catalogue of European Lightsources