title: Note: Enhancement of the extreme ultraviolet emission from a potassium plasma by dual laser irradiation.
abstract: Emission spectra from multiply charged potassium ions ranging from K(3+) to K(5+) have been obtained in the extreme ultraviolet (EUV) spectral region. A strong emission feature peaking around 38 nm, corresponding to a photon energy of 32.6 eV, is the dominant spectral feature at time-averaged electron temperatures in the range of 8-12 eV. The variation of this emission with laser intensity and the effects of pre-pulses on the relative conversion efficiency (CE) have been explored experimentally and indicate that an enhancement of about 30% in EUV CE is readily attainable.
authors.affiliation: Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Higashiguchi
authors.affiliation: Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan.
authors.forename: Mami
authors.initials: M
authors.lastname: Yamaguchi
authors.affiliation: Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan.
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Otsuka
authors.affiliation: Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagata
authors.affiliation: Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Toyama 930-8555, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Ohashi
authors.affiliation: School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.
authors.forename: Bowen
authors.initials: B
authors.lastname: Li
authors.affiliation: School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Rebekah
authors.initials: R
authors.lastname: D'Arcy
authors.affiliation: School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Padraig
authors.initials: P
authors.lastname: Dunne
authors.affiliation: School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Gerry
authors.initials: G
authors.lastname: O'Sullivan