title: Lasing of infrared free-election lasers using the storage ring NIJI-IV.
abstract: We report for the first time to our knowledge the experimental achievement of a storage ring free-electron laser (FEL) device dedicated to applications in the IR region. IR FELs were oscillated in the wavelength region of 1392-1502 nm, and the relative linewidth was 3 x 10(-4). The maximum power of the IR FEL transmitted through a vacuum window was approximately 0.3 mW, and the intracavity power was approximately 2 W. We have already observed an intensive quasi-monochromatic x ray by using FEL Compton backscattering. The results of our study are expected to lead to applications in which an IR FEL and a quasi-monochromatic x ray will be used simultaneously.
authors.affiliation: Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. sei.n@aist.go.jp
authors.forename: Norihiro
authors.initials: N
authors.lastname: Sei
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ogawa
authors.forename: Kawakatsu
authors.initials: K
authors.lastname: Yamada