3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors

Abstract Very high-quality sapphire substrates are key elements of the cryogenic Japanese gravitational interferometer KAGRA, in which they are used to build the main mirrors, working as the test masses to sense the gravitational waves. To meet the extreme requirements of this system, the sapphire t...

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Autores principales:	Manuel Marchiò, Matteo Leonardi, Marco Bazzan, Raffaele Flaminio
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a3ef362658e54aecb073a29b27295bf5
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spelling	oai:doaj.org-article:a3ef362658e54aecb073a29b27295bf52021-12-02T13:24:36Z3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors10.1038/s41598-020-80313-12045-2322https://doaj.org/article/a3ef362658e54aecb073a29b27295bf52021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80313-1https://doaj.org/toc/2045-2322Abstract Very high-quality sapphire substrates are key elements of the cryogenic Japanese gravitational interferometer KAGRA, in which they are used to build the main mirrors, working as the test masses to sense the gravitational waves. To meet the extreme requirements of this system, the sapphire test masses must possess an extremely low optical absorption, which makes their study challenging using standard methods. In this paper, we illustrate the results obtained on two typical samples using a specialized absorption setup based on the technique of Photo-thermal Common-path Interferometry (PCI). Our system combines a very high sensitivity to small absorption features with the possibility to perform a full three-dimensional mapping of the sample volume. Our results elucidate how the ultra-low absorption variations inside the sample possess a structure that is probably inherited from the growth history of the sample. Some conclusions on the role of structural defects as preferential sites for the inclusion of absorbing centers are drawn.Manuel MarchiòMatteo LeonardiMarco BazzanRaffaele FlaminioNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Manuel Marchiò Matteo Leonardi Marco Bazzan Raffaele Flaminio 3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
description	Abstract Very high-quality sapphire substrates are key elements of the cryogenic Japanese gravitational interferometer KAGRA, in which they are used to build the main mirrors, working as the test masses to sense the gravitational waves. To meet the extreme requirements of this system, the sapphire test masses must possess an extremely low optical absorption, which makes their study challenging using standard methods. In this paper, we illustrate the results obtained on two typical samples using a specialized absorption setup based on the technique of Photo-thermal Common-path Interferometry (PCI). Our system combines a very high sensitivity to small absorption features with the possibility to perform a full three-dimensional mapping of the sample volume. Our results elucidate how the ultra-low absorption variations inside the sample possess a structure that is probably inherited from the growth history of the sample. Some conclusions on the role of structural defects as preferential sites for the inclusion of absorbing centers are drawn.
format	article
author	Manuel Marchiò Matteo Leonardi Marco Bazzan Raffaele Flaminio
author_facet	Manuel Marchiò Matteo Leonardi Marco Bazzan Raffaele Flaminio
author_sort	Manuel Marchiò
title	3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
title_short	3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
title_full	3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
title_fullStr	3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
title_full_unstemmed	3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
title_sort	3d characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a3ef362658e54aecb073a29b27295bf5
work_keys_str_mv	AT manuelmarchio 3dcharacterizationoflowopticalabsorptionstructuresinlargecrystallinesapphiresubstratesforgravitationalwavedetectors AT matteoleonardi 3dcharacterizationoflowopticalabsorptionstructuresinlargecrystallinesapphiresubstratesforgravitationalwavedetectors AT marcobazzan 3dcharacterizationoflowopticalabsorptionstructuresinlargecrystallinesapphiresubstratesforgravitationalwavedetectors AT raffaeleflaminio 3dcharacterizationoflowopticalabsorptionstructuresinlargecrystallinesapphiresubstratesforgravitationalwavedetectors
_version_	1718393050996146176

3D characterization of low optical absorption structures in large crystalline sapphire substrates for gravitational wave detectors

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