Input optics systems of the KAGRA detector during O3GK
T. Akutsu, M. Ando, K. Arai, Y. Arai, S. Araki, A. Araya, N. Aritomi,, H. Asada, Y. Aso, S. Bae, Y. Bae, L. Baiotti, R. Bajpai, M. A. Barton, K., Cannon, Z. Cao, E. Capocasa, M. Chan, C. Chen, K. Chen, Y. Chen, C-I. Chiang,, H. Chu, Y-K. Chu, S. Eguchi, Y. Enomoto, R. Flaminio
TL;DR
This paper provides an overview of KAGRA's input optics systems during its O3GK observation run, highlighting their successful operation and impact on detector sensitivity.
Contribution
It presents the design, implementation, and operational stability of KAGRA's input optics systems during the O3GK observation period.
Findings
Optics systems operated stably during observations
Laser frequency noise limited sensitivity above a few kHz
Laser intensity did not significantly limit sensitivity
Abstract
KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with the GEO 600 detector from April 7th -- 21st, 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 kHz, whereas the laser intensity did not significantly limit the detector sensitivity.
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