title: Characterization of a high-brilliance soft x-ray laser at 13.9 nm by use of an oscillator-amplifier configuration.
abstract: We have improved a highly coherent x-ray laser at 13.9 nm using an oscillator-amplifier configuration. To improve a high-brilliance x-ray laser, we adopted traveling wave pumping for the amplifier target and rotated the amplifier target 3-4 mrad in the counterclockwise direction. Thereby, a seed x-ray laser can be amplified by medium plasma of the amplifier target with a high gain coefficient. The amplified x-ray laser has the output energy of approximately 1.3 microJ, corresponding to a large photon flux of 6.5 x 10(10) photons/pulse and a high peak brilliance of 5 x 10(26) photons/(s x mm(2) x mrad(2) x 0.01% bandwidth).
authors.affiliation: X-ray Laser Group, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa, Kyoto 619-0215, Japan. nishikino.masaharu@jaea.go.jp
authors.forename: Masaharu
authors.initials: M
authors.lastname: Nishikino
authors.forename: Noboru
authors.initials: N
authors.lastname: Hasegawa
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kawachi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamatani
authors.forename: Kota
authors.initials: K
authors.lastname: Sukegawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nagashima