title: High-performance deep-ultraviolet optics for free-electron lasers.
abstract: Working with wavelengths shorter than the deep ultraviolet involves the development of dedicated optics for free-electron lasers with devoted coating techniques and characterizations. High-performance deep-ultraviolet optics are specially developed to create low-loss, high-reflectivity dielectric mirrors with long lifetimes in harsh synchrotron radiation environments. In February 2001, lasing at 189.7 nm, the shortest wavelength obtained so far with free-electron-laser oscillators, was obtained at the European Free-electron-laser project at ELETTRA Synchrotron Light Laboratory, Trieste, Italy. In July 2001, 330-mW extracted power at 250 nm was measured with optimized transmission mirrors. Research and development of coatings correlated to lasing performance are reported.
authors.affiliation: Fraunhofer Institut für Angewandte Optik und Feinmechanik, Jena, Germany. gatto@iof.fhg.de
authors.forename: Alexandre
authors.initials: A
authors.lastname: Gatto
authors.forename: Roland
authors.initials: R
authors.lastname: Thielsch
authors.forename: Joerg
authors.initials: J
authors.lastname: Heber
authors.forename: Norbert
authors.initials: N
authors.lastname: Kaiser
authors.forename: Detlev
authors.initials: D
authors.lastname: Ristau
authors.forename: Stephan
authors.initials: S
authors.lastname: Günster
authors.forename: Juergen
authors.initials: J
authors.lastname: Kohlhaas
authors.forename: Marino
authors.initials: M
authors.lastname: Marsi
authors.forename: Mauro
authors.initials: M
authors.lastname: Trovò
authors.forename: Richard
authors.initials: R
authors.lastname: Walker
authors.forename: David
authors.initials: D
authors.lastname: Garzella
authors.forename: Marie Emmanuelle
authors.initials: ME
authors.lastname: Couprie
authors.forename: Philippe
authors.initials: P
authors.lastname: Torchio
authors.forename: Marco
authors.initials: M
authors.lastname: Alvisi
authors.forename: Claude
authors.initials: C
authors.lastname: Amra