title: Pump energy reduction for a high gain Ag X-ray laser using one long and two short pump pulses.
abstract: A pump scheme with one long and two short pump pulses is proposed, in a grazing incidence pumping x-ray laser (XRL) configuration. A 360 ps long pulse, prepares a plasma in a low charge state. Then, an initial short pulse ionizes the plasma to an optimal charge state, while the second short pulse induces strong collisional excitation in the gain region. With only 200 mJ of pump energy on target, a compact Ag XRL at 13.9 nm with a gain coefficient of 55  cm(-1) was achieved.
authors.affiliation: National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Atomistilor 409, Magurele 077125, Romania.
authors.forename: Romeo A
authors.initials: RA
authors.lastname: Banici
authors.forename: Gabriel V
authors.initials: GV
authors.lastname: Cojocaru
authors.forename: Razvan G
authors.initials: RG
authors.lastname: Ungureanu
authors.forename: Razvan
authors.initials: R
authors.lastname: Dabu
authors.forename: Daniel
authors.initials: D
authors.lastname: Ursescu
authors.forename: Holger
authors.initials: H
authors.lastname: Stiel