Note: Enhancement of the extreme ultraviolet emission from a potassium plasma by dual laser irradiation

Takeshi Higashiguchi; Mami Yamaguchi; Takamitsu Otsuka; Takeshi Nagata; Hayato Ohashi; Bowen Li; Rebekah D'Arcy; Padraig Dunne; Gerry O'Sullivan

doi:10.1063/1.4894384

Note: Enhancement of the extreme ultraviolet emission from a potassium plasma by dual laser irradiation

Rev Sci Instrum. 2014 Sep;85(9):096102. doi: 10.1063/1.4894384.

Authors

Takeshi Higashiguchi¹, Mami Yamaguchi¹, Takamitsu Otsuka¹, Takeshi Nagata¹, Hayato Ohashi², Bowen Li³, Rebekah D'Arcy⁴, Padraig Dunne⁴, Gerry O'Sullivan⁴

Affiliations

¹ Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan.
² Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Toyama 930-8555, Japan.
³ School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.
⁴ School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.

PMID: 25273788
DOI: 10.1063/1.4894384

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.