title: K-shell x-ray emission enhancement via self-guided propagation of intense laser pulses in Ar clusters.
abstract: K-shell x-ray at about 3 keV emitted from Ar clusters irradiated by 110 mJ 55 fs intense laser pulses is studied. The x-ray flux is optimized by moving the nozzle away from the focus of the laser pulse. The total flux of K-shell x-ray photons in 4pi reaches a maximum of 4.5x10(9) photons/shot with a conversion efficiency of 2.5x10(-5) when the nozzle displacement is 2 mm and a long plasma channel is observed by a probe beam.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Chen
authors.forename: Xiao-Xuan
authors.initials: XX
authors.lastname: Lin
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Jing-Long
authors.initials: JL
authors.lastname: Ma
authors.forename: Run-Ze
authors.initials: RZ
authors.lastname: Li
authors.forename: Yu-Tong
authors.initials: YT
authors.lastname: Li
authors.forename: Zhao-Hua
authors.initials: ZH
authors.lastname: Wang
authors.forename: Shou-Jun
authors.initials: SJ
authors.lastname: Wang
authors.forename: Zhi-Yi
authors.initials: ZY
authors.lastname: Wei
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang