日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 P (宇宙惑星科学) » P-CG 宇宙惑星科学複合領域・一般

[P-CG22] Shock responses of planetary materials elucidated from meteorites and dynamic compression experiments

2019年5月28日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:関根 利守(Center for High Pressure Science and Technology Advanced Research)、奥地 拓生(岡山大学惑星物質研究所)

[PCG22-P09] Transparency of shock-compressed single crystal diamond

*片桐 健登1尾崎 典雅1,2宮西 宏併2梅田 悠平1森岡 信太郎1佐野 考好2兒玉 了祐1,2 (1.大阪大学、2.大阪大学 レーザー科学研究所)

キーワード:衝撃圧縮、高強度レーザー、ダイヤモンド、透明度、屈折率

Carbon is one of the most prominent elements in nature and it is abundant in the Earth and many other planets. Diamond, a metastable phase of carbon, is naturally synthesized in deep inside of the Earth where substances are isotropically pressured. Diamond is known for its many unique properties such as high hardness, low compressibility, small thermal expansion coefficient, and transparency. Since it is important to understand how substances behave under high pressure, properties of compressed diamond have been measured in a wide range of pressures up to 5 TPa. However, the transparency of diamond under pressure has not been fully elucidated. Here, we report the measurment of the pressure dependency of the absorption coefficient of laser shock compressed single crystalline diamond. A high-intensity laser was utilized to shock compress the diamond sample along its <100> direction, and velocity interferometer systems for any reflector (VISARs) were used to determine the absorption coefficient and pressure. It was found that single crystalline diamond remains largely transparent to the probe laser for VISAR (λ=532 nm) up to 140 GPa. The pressure dependence of the refractive index will also be discussed.

This experiment was conducted under the joint research of the Institute of Laser Engineering, Osaka University. This work was supported in part by JSPS KAKENHI grant No. 16H02246 and No. 16H01119. The part of work was also supported by Genesis Research Institute, Inc. (Konpon-ken, TOYOTA).