Selection of target elements for laser-produced plasma soft x-ray sources

We demonstrated the upper limitation to the number of shots, i.e., target lifetime, together with the number of photons emitted in the water-window soft x-ray spectral region from a number of targets used as sources in this spectral region, for multi-shot irradiation at the same position on the targ...

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Published inOptics letters Vol. 43; no. 9; p. 2042
Main Authors Tamura, Toshiki, Arai, Goki, Kondo, Yoshiki, Hara, Hiroyuki, Hatano, Tadashi, Ejima, Takeo, Jiang, Weihua, Suzuki, Chihiro, O'Sullivan, Gerry, Higashiguchi, Takeshi
Format Journal Article
LanguageEnglish
Published United States 01.05.2018
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Summary:We demonstrated the upper limitation to the number of shots, i.e., target lifetime, together with the number of photons emitted in the water-window soft x-ray spectral region from a number of targets used as sources in this spectral region, for multi-shot irradiation at the same position on the target surface. The spectra involved result from unresolved transition arrays originating from n=3-n=4 transitions in medium-Z element plasmas and from n=4-n=4 transitions originating in high-Z plasmas. The output flux was maintained for the highest number of shots in the case of the high melting point element molybdenum, and the total output in the water window was 7.7×10   photons/sr at a laser power density of 1.2×10   W/cm .
ISSN:1539-4794
DOI:10.1364/ol.43.002042