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

Toshiki Tamura, Goki Arai, Yoshiki Kondo, Hiroyuki Hara, Tadashi Hatano, Takeo Ejima, Weihua Jiang, Chihiro Suzuki, Gerry O’Sullivan, Takeshi Higashiguchi

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)


    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 × 1013 photons∕sr at a laser power density of 1.2 × 101 W∕cm2.

    Original languageEnglish
    Pages (from-to)2042-2045
    Number of pages4
    JournalOptics Letters
    Issue number9
    Publication statusPublished - 2018 May 1

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics


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