Refractive Index Measurement of Magnesium Oxide Under Ultra High-Pressure

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  • MIYANISHI Kohei
    Graduate School of Engineering, Osaka University
  • OZAKI Norimasa
    Graduate School of Engineering, Osaka University Photon Pioneers Center, Osaka University
  • TANGE Yoshinori
    Geodynamics Research Center, Ehime University Earth-Life Science Institute Ehime Satellite, Tokyo Institute of Technology Japan Synchrotron Radiation Research Institute
  • KIMURA Tomoaki
    Geodynamics Research Center, Ehime University
  • SAKAWA Youichi
    Institute of Laser Engineering, Osaka University,
  • SANO Takayoshi
    Institute of Laser Engineering, Osaka University,
  • TSUCHIYA Taku
    Geodynamics Research Center, Ehime University Earth-Life Science Institute Ehime Satellite, Tokyo Institute of Technology
  • KODAMA Ryosuke
    Graduate School of Engineering, Osaka University Photon Pioneers Center, Osaka University

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  • 超高圧下における酸化マグネシウムの屈折率計測
  • チョウコウアツカ ニ オケル サンカ マグネシウム ノ クッセツリツ ケイソク

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Abstract

We investigated the refractive index of shock-compressed magnesium oxide in the 100‒400 GPa pressure range. Shock Hugoniot and a refractive index were measured using a laser-shock compression technique. The refractive index of MgO decreases monotonically with pressure to ~220 GPa along the Hugoniot and increases above the pressure. This result indicates that magnesium oxide is optically transparent enough to be used as a shock window at such dynamic high pressures.

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