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Oxford University Press, Progress of Theoretical and Experimental Physics, 2(2023), 2022

DOI: 10.1093/ptep/ptac166

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Input optics systems of the KAGRA detector during O3GK

Journal article published in 2022 by T. Akutsu ORCID, M. Ando, K. Arai, Y. Arai, S. Araki, A. Araya ORCID, N. Aritomi ORCID, H. Asada ORCID, Y. Aso ORCID, S. Bae ORCID, Y. Bae, L. Baiotti ORCID, R. Bajpai ORCID, M. A. Barton ORCID, K. Cannon ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Postprint: archiving allowed
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Data provided by SHERPA/RoMEO

Abstract

Abstract KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25 to March 10, 2020, and its first joint observation with the GEO 600 detector from April 7 to April 21, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kilohertz, whereas the laser intensity did not significantly limit the detector sensitivity.