1. Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871, Japan
2. Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-Cho, Toyonaka, Osaka 560-0043, Japan
3. Center for Science and Technology under Extreme Conditions, Osaka University, 1-3 Machikaneyama-Cho, Toyonaka, Osaka 560-0043, Japan