title: Development of a pumping laser system for x-ray laser research.
abstract: A two-beam chirped-pulse-amplification Nd:glass laser system dedicated to x-ray laser research is described. Each beam provides an output energy of 20 J with a typical pulse duration of 1.3 ps. A prepulse of variable duration is generated by use of a novel, to our knowledge, optical system. A reflection optical system, comprised of an off-axis parabolic mirror and a spherical mirror, produces a line focus with 6-mm length and 165-microm width without chromatic aberration. By use of this pumping laser system, the nickel-like silver x-ray laser at a wavelength of 13.9 nm has been demonstrated.
authors.affiliation: Advanced Photon Research Center, Kansai Research Establishment, Japan Atomic Energy Research Institute, 8-1, Umemidai, Kizu, Kyoto 616-0215, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kawachi
authors.forename: Masataka
authors.initials: M
authors.lastname: Kado
authors.forename: Momoko
authors.initials: M
authors.lastname: Tanaka
authors.forename: Noboru
authors.initials: N
authors.lastname: Hasegawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nagashima
authors.forename: Kouta
authors.initials: K
authors.lastname: Sukegawa
authors.forename: Peixiang
authors.initials: P
authors.lastname: Lu
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Takahashi
authors.forename: Sinichi
authors.initials: S
authors.lastname: Namba
authors.forename: Masato
authors.initials: M
authors.lastname: Koike
authors.forename: Akira
authors.initials: A
authors.lastname: Nagashima
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Kato