Long-baseline optical fiber interferometer instruments and science

Takayuki Kotani; Jun Nishikawa; Koichi Sato; Masanori Yoshizawa; Naoko Ohishi; Toshio Fukushima; Yasuo Torii; Ko Matsuda; Koichi Kubo; Hikaru Iwashita; Shunsaku Suzuki

doi:10.1117/12.458227

21 February 2003 Long-baseline optical fiber interferometer instruments and science

Takayuki Kotani, Jun Nishikawa, Koichi Sato, Masanori Yoshizawa, Naoko Ohishi, Toshio Fukushima, Yasuo Torii, Ko Matsuda, Koichi Kubo, Hikaru Iwashita, Shunsaku Suzuki

Author Affiliations +

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.458227
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Developments of fiber linked optical interferometer are reported. This interferometer is a part of MIRA-I.2 interferometer (Mitaka InfraRed and optical Array). MIRA-I.2 is an optical interferometer with a 30 meters long baseline. It consists of two 30cm siderostats, tip-tilt mirrors, vacuum pipes delay lines and detectors. We plan to use two 60 meters long polarization-maintaining fibers for arms of the interferometer, instead of vacuum pipes. The developments include dispersion and polarization compensation of fiber and fiber injection module. In laboratory experiments, dispersion compensation succeeded. The fringe visibility was 0.93 for wide-band, where the central wavelength of light was 700nm, and bandwidth was 200nm, while 0.95 with a He-Ne laser. We used BK7 glass wedge for dispersion compensation. About fiber injection module, basic optical design has completed. The results of our fiber interferometer could contribute to OHANA (Optical Hawaiian Array for Nanoradian Astronomy) project. We present new science targets, white dwarves and T Tauri stars, and an 800 m delayline concept in CFHT for the project.

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Takayuki Kotani, Jun Nishikawa, Koichi Sato, Masanori Yoshizawa, Naoko Ohishi, Toshio Fukushima, Yasuo Torii, Ko Matsuda, Koichi Kubo, Hikaru Iwashita, and Shunsaku Suzuki "Long-baseline optical fiber interferometer instruments and science", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.458227

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