title: Demonstration of a transient-gain nickel-like xenon-ion x-ray laser.
abstract: We demonstrate a high-gain nickel-like xenon-ion x-ray laser, using a picosecond-laser-irradiated gas-puff target. The elongated x-ray laser plasma column was produced by irradiation of the gas-puff target with line-focused double picosecond laser pulses with a total energy of 18 J in a traveling-wave excitation scheme. Strong lasing at 9.98 nm was observed, and a high gain coefficient of 17.4 cm(-1) was measured on the transient collisionally excited 4d-4p , J=0-1 transition for nickel-like xenon ions with target lengths as great as 0.45 cm. A weak nickel-like lasing line at a shorter wavelength of 9.64 nm was also observed, with a gain coefficient of 5.9 cm(-1) .
authors.forename: Peixiang
authors.initials: P
authors.lastname: Lu
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kawachi
authors.forename: Maki
authors.initials: M
authors.lastname: Kishimoto
authors.forename: Kouta
authors.initials: K
authors.lastname: Sukegawa
authors.forename: Momoko
authors.initials: M
authors.lastname: Tanaka
authors.forename: Noboru
authors.initials: N
authors.lastname: Hasegawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Suzuki
authors.forename: Renzhong
authors.initials: R
authors.lastname: Tai
authors.forename: Masataka
authors.initials: M
authors.lastname: Kado
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nagashima
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Daido
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Kato
authors.forename: Henryk
authors.initials: H
authors.lastname: Fiedorowicz
authors.forename: Andrzej
authors.initials: A
authors.lastname: Bartnik