*Fumiyoshi Kuwashima1, Takuya Shirao1, Kazuyuki Iwao1, Masahiko Tani2, Kazuyoshi Kurihara3, Kohji Yamamoto2, Osamu Morikawa4, Hideaki Kitahara2, Makoto Nakajima5
(1. Fukui Univ. of Tech., 2. Research Center for Development of Far-Infrared Region, University of Fukui, 3. Fac. of Educ., Univ. of Fukui, 4. Chair of Liberal Arts, Japan Coast Guard Academy, 5. Institute of Laser engineering, Osaka Univ)