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Demonstration for a two-axis interferometric tilt sensor in KAGRA

Kokeyama, Keiko, Park, June Gyu, Cho, Kyuman, Kirii, Shin, Akutsu, Tomotada, Nakano, Masayuki, Kambara, Shogo, Hasegawa, Kunihiko, Ohishi, Naoko, Doi, Kohei and Kawamura, Seiji 2018. Demonstration for a two-axis interferometric tilt sensor in KAGRA. Physics Letters A 382 (29) , pp. 1950-1955. 10.1016/j.physleta.2018.05.004

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Abstract

Recently, a folded Mach–Zehnder interferometer with homodyne in- and quadrature-phase detection was proposed as a high-precision, wide-dynamic range tilt sensor. By way of a practical application and to validate actual performance, two-axis tilt sensors were developed and installed for one mirror of the input mode cleaner cavity in KAGRA, the large-scale cryogenic gravitational-wave telescope in Kamioka, Gifu, Japan. Building on previous work, we have demonstrated that the two-axis tilt sensor has properly sensed the tilt angle changes of the mirror motion with high precision and without calibration. Compared with our initial angular sensor, an optical lever, which is calibrated by using the interferometer tilt sensor, we found that both sensors showed actual tilt motions of the mirror at low frequencies, and the two-axis interferometer sensor has a better sensitivity at higher frequencies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0375-9601
Date of Acceptance: 3 May 2018
Last Modified: 22 Mar 2021 15:00
URI: http://orca.cardiff.ac.uk/id/eprint/139946

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