Input optics systems of the KAGRA detector during O3GK
Progress of Theoretical and Experimental Physics, 2023•academic.oup.com
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 …
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 …
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.