[1] Russian Acad Sci, Inst Appl Phys, 46 Ulyanov St, Nizhnii Novgorod 603950, Russia
[2] Kitami Inst Technol, 165 Koen Cho, Kitami, Hokkaido 0908507, Japan
[3] Osaka Univ, Inst Laser Engn, 2-6 Yamada Oka, Suita, Osaka 5650871, Japan
[4] Natl Inst Fus Sci, 322-6 Oroshi Cho, Toki, Gifu 5095292, Japan