FERMI (Free Electron laser Radiation for Multidisciplinary Investigations) is a seeded free electron laser (FEL) source operating at Elettra Sincrotrone Trieste. FERMI is an international user facility for scientific investigations ranging from chemistry to condensed matter physics and from advanced technology to biology.
Among existing FEL sources FERMI is unique in many respects. The implemented seeded FEL scheme guarantees the generation of highly transversely and longitudinally coherent ultrashort (5-100 femtosecond) pulses in the wavelength range from 100 nm to 4 nm in the first harmonic. The use of APPLE II-type undulators allows for variable 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 2021.
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View FERMI on wayforlight.eu
The catalogue of European Lightsources