1 Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, Kizugawa 619-0215, Japan
2 同上
3 A. M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia
4 Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia
5 Department of Applied Physics, Graduate School and Faculty of Engineering, Osaka City University, Osaka 558-8585, Japan
6 Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
7 Central Research Institute of Electric Power Industry, Yokosuka 240-0196, Japan
8 Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea