Enhancement of water-window soft x-ray emission from laser-produced Au plasma under low-pressure nitrogen atmosphere

Christian John, Maki Kishimoto, Tomoyuki Johzaki, Takeshi Higashiguchi, Noboru Kakunaka, Yasuhiro Matsumoto, Noboru Hasegawa, Masaharu Nishikino, Takeo Ejima, Atsushi Sunahara, Takuma Endo, Shinichi Namba

    研究成果: Article査読

    4 被引用数 (Scopus)

    抄録

    To generate bright water-window (WW) soft x rays (2.3–4.4 nm), gold slab targets were irradiated with laser pulses (1064 nm, 7 ns, 1 J). Emission spectroscopy showed that the introduction of low-pressure nitrogen enhanced the soft x-ray yield emitted from the laser-produced Au plasma. The intensity of the WW x-ray transported in a 400-Pa N 2 atmosphere from the laser-produced plasma increased by 3.8 times over that in vacuum. Considering a strong x-ray absorption, the x-ray yield emitted directly from the Au plasma in the N 2 gas was evaluated to be 13 times higher than that in vacuum. Although similar measurements were made for various gases, only N 2 gas causes an increase in a soft x-ray yield. The processes leading to this enhancement mechanism were revealed by using hydrodynamic simulation and atomic structure codes.

    本文言語English
    ページ(範囲)1439-1442
    ページ数4
    ジャーナルOptics Letters
    44
    6
    DOI
    出版ステータスPublished - 2019

    ASJC Scopus subject areas

    • 原子分子物理学および光学

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