Input optics systems of the KAGRA detector during O3GK

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Title:	Input optics systems of the KAGRA detector during O3GK
Authors:	Liu, Guo-chin
Date:	2022-12-09
Issue Date:	2024-08-06 12:05:33 (UTC+8)
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.
Relation:	Progress of Theoretical and Experimental Physics 2023(2),　023F01
DOI:	10.1093/ptep/ptad063
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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