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Single and coupled cavity mode sensing schemes using a diagnostic field

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dc.contributor.authorGoodwin-Jones, A.W.
dc.contributor.authorZhu, H.
dc.contributor.authorBlair, C.
dc.contributor.authorBrown, D.D.
dc.contributor.authorvan Heijningen, J.
dc.contributor.authorJu, L.
dc.contributor.authorZhao, C.
dc.date.issued2023
dc.description.abstractPrecise optical mode matching is of critical importance in experiments using squeezed-vacuum states. Automatic spatial-mode matching schemes have the potential to reduce losses and improve loss stability. However, in quantum-enhanced coupled-cavity experiments, such as gravitational-wave detectors, one must also ensure that the sub-cavities are also mode matched. We propose what we believe to be a new mode sensing scheme, which works for simple and coupled cavities. The scheme requires no moving parts, nor tuning of Gouy phases. Instead a diagnostic field tuned to the HG20/LG10 mode frequency is used. The error signals are derived to be proportional to the difference in waist position, and difference in Rayleigh ranges, between the sub-cavity eigenmodes. The two error signals are separable by 90 degrees of demodulation phase. We demonstrate reasonable error signals for a simplified Einstein Telescope optical design. This work will facilitate routine use of extremely high levels of squeezing in current and future gravitational-wave detectors.
dc.description.statementofresponsibilityAaron W. Goodwin-Jones, Haochen Zhu, Carl Blair, Daniel D. Brown, Joris van Heijningen, Li Ju, and Chunnong Zhao
dc.identifier.citationOptics Express, 2023; 31(21):35068-35085
dc.identifier.doi10.1364/OE.502911
dc.identifier.issn1094-4087
dc.identifier.issn1094-4087
dc.identifier.orcidBrown, D.D. [0000-0001-7851-3939]
dc.identifier.urihttps://hdl.handle.net/2440/142101
dc.language.isoen
dc.publisherOptical Society of America (OSA)
dc.relation.granthttp://purl.org/au-research/grants/arc/CE170100004
dc.relation.granthttp://purl.org/au-research/grants/arc/DE230101035
dc.rights© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Open access journal article PDFs may be governed by the Optica Publishing Group Open Access Publishing Agreement signed by the author and any applicable copyright laws. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.
dc.source.urihttps://doi.org/10.1364/oe.502911
dc.subjectspatial-mode; schemes
dc.titleSingle and coupled cavity mode sensing schemes using a diagnostic field
dc.typeJournal article
pubs.publication-statusPublished

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