Free-electron lasers sources for scientific applications

Abstract

The free-electron laser ("FEL") has proven to be an invaluable source of radiation in the UV to far infrared spectral ranges. It is based on the amplification of an optical wave by a high energy electron beam oscillating transversely to its prop a- gation. In the last decade, several FELs have been designed and built as user dedicated facilities. Presently, seven infrared FEL s, such as CLIO at Orsay (France), are running more than 1000 hours/year for users performing experiments in various scientific fields. In the UV spectral range, the Super-ACO (Orsay, France) FEL is promoting applications in various fields. The main appli- cations are described and prospects are given.