title: Dramatic enhancement of optical-field-ionization collisional-excitation x-ray lasing by an optically preformed plasma waveguide.
abstract: Dramatic enhancement of optical-field-ionization collisional-excitation x-ray lasing is achieved by using an optically preformed plasma waveguide. With a 9-mm-long pure krypton plasma waveguide prepared by using the axicon-ignitor-heater scheme, lasing at 32.8 nm is enhanced by 400 folds relative to the case without the plasma waveguide. An output level of 8 x 10(10) photon/shot is reached at an energy conversion efficiency of 2 x 10(-6). The same method is used to achieve x-ray lasing in a gas jet for the high-threshold low-gain transition at 46.9 nm in neonlike argon.
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
authors.forename: M-C
authors.initials: MC
authors.lastname: Chou
authors.forename: P-H
authors.initials: PH
authors.lastname: Lin
authors.forename: C-A
authors.initials: CA
authors.lastname: Lin
authors.forename: J-Y
authors.initials: JY
authors.lastname: Lin
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: S-Y
authors.initials: SY
authors.lastname: Chen