Demonstration for a two-axis interferometric tilt sensor in KAGRA

Keiko Kokeyama, June Gyu Park, Kyuman Cho, Shin Kirii, Tomotada Akutsu, Masayuki Nakano, Shogo Kambara, Kunihiko Hasegawa, Naoko Ohishi, Kohei Doi, Seiji Kawamura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1950-1955
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number29
Publication statusPublished - 2018 Jul 26

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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