Yasutsugu Usami (Kyushu University / JP; Gigaphoton.Inc / JP), Kaname Imokawa (Gigaphoton.Inc / JP), Ryoichi Nohdomi (Gigaphoton.Inc / JP), Kouji Kakizaki (Gigaphoton.Inc / JP), Hakaru Mizoguchi (Gigaphoton.Inc / JP)