[20p-E205-1~12] 3.8 Optical measurement, instrumentation, and sensor

[20p-E205-3] Scattering measurement system using Michelson interferometer

〇Issei Sugai¹, Taiki Murakami¹, Takamasa Suzuki², Tomoyuki Uehara³, Seiji Kawamura⁴, Tomotada Akutsu⁵, Takashi Sato², Masashi Ohkawa² (1.Grad. School of Sci. and Tech., Niigata Univ., 2.Fac. of Eng., Niigata Univ., 3.Dept. of Comm. Eng., NDA, 4.Grad. School of Sci. of Nagoya Univ., 5.NAOJ)

Keywords:scattering measurement, Michelson Interferometer, KAGRA

The Japanese gravitational-wave antenna, called KAGRA, is a 3-km Michelson-type laser interferometer to detect gravitational waves. Beam damps in KAGRA play important role to attenuate stray light which causes serious noise in gravitational-wave detection. It is significant to measure scattered light of the beam damps, which is too small to evaluate it using a typical method. So, we propose a unique method for scattering measurement using a Michelson interferometer.