Simultaneous Birefringence and Absorption Mapping in Large-Size Sapphire Substrates for Gravitational-Wave Interferometry

Simultaneous Birefringence and Absorption Mapping in Large-Size Sapphire Substrates for Gravitational-Wave Interferometry | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Simultaneous Birefringence and Absorption Mapping in Large-Size Sapphire Substrates for Gravitational-Wave Interferometry Simon Zeidler, Pengbo Li, Marc Eisenmann, Marco Bazzan, Matteo Leonardi This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-1563039/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 04 Dec, 2023 Read the published version in Scientific Reports → Version 1 posted 10 You are reading this latest preprint version Abstract In high-sensitive laser interferometers, such as the gravitational-wave detector KAGRA, ultra-high quality mirrors are essential. In the case of KAGRA, where cavity-mirrors are cooled down to 20 K, we are using large-size Sapphire crystals as the substrate for the main mirrors to achieve both a good optical quality (i.e., low absorption and uniform refractive index) and optimized thermal behavior under cryogenic temperatures. In order to characterize refractive-index inhomogeneities of large-size uniaxial samples such as the KAGRA Sapphire test-masses, we developed a dedicated setup, allowing to resolve birefringence changes with a sensitivity in the order of ∆n ≈ 10 −10 and a spatial resolution of 0.3 × 0.3 mm 2. In this paper, we will further show how we could draw information of internal stress distributions from the measured birefringence and present for the first time measurements on a KAGRA-sized Sapphire substrate which has been characterized in terms of absorption already in an earlier work. Both birefringence inhomogeneities and absorption distributions will be compared and correlations discussed. Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 04 Dec, 2023 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Major revision 19 Sep, 2022 Reviews received at journal 07 Jul, 2022 Reviewers agreed at journal 04 Jul, 2022 Reviews received at journal 28 Jun, 2022 Reviewers agreed at journal 09 Jun, 2022 Reviewers invited by journal 21 Apr, 2022 Editor assigned by journal 21 Apr, 2022 Editor invited by journal 18 Apr, 2022 Submission checks completed at journal 18 Apr, 2022 First submitted to journal 15 Apr, 2022 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-1563039","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":99449751,"identity":"4574cf4e-efbc-4d48-9f5c-a495b6b436dd","order_by":0,"name":"Simon 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