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Feedback control of thermal lensing in a high optical power cavity

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Fan, Y.; Zhao, C.; Degallaix, J.; Ju, L.; Blair, D. G.; Slagmolen, B. J. J.; Hosken, D. J.; Brooks, A. F.; Veitch, P. J.; Munch, J.

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This paper reports automatic compensation of strong thermal lensing in a suspended 80 m optical cavity with sapphire test mass mirrors. Variation of the transmitted beam spot size is used to obtain an error signal to control the heating power applied to the cylindrical surface of an intracavity compensation plate. The negative thermal lens created in the compensation plate compensates the positive thermal lens in the sapphire test mass, which was caused by the absorption of the high intracavity...[Show more]

dc.contributor.authorFan, Y.
dc.contributor.authorZhao, C.
dc.contributor.authorDegallaix, J.
dc.contributor.authorJu, L.
dc.contributor.authorBlair, D. G.
dc.contributor.authorSlagmolen, B. J. J.
dc.contributor.authorHosken, D. J.
dc.contributor.authorBrooks, A. F.
dc.contributor.authorVeitch, P. J.
dc.contributor.authorMunch, J.
dc.date.accessioned2015-10-26T23:21:45Z
dc.date.available2015-10-26T23:21:45Z
dc.identifier.issn0034-6748
dc.identifier.urihttp://hdl.handle.net/1885/16094
dc.description.abstractThis paper reports automatic compensation of strong thermal lensing in a suspended 80 m optical cavity with sapphire test mass mirrors. Variation of the transmitted beam spot size is used to obtain an error signal to control the heating power applied to the cylindrical surface of an intracavity compensation plate. The negative thermal lens created in the compensation plate compensates the positive thermal lens in the sapphire test mass, which was caused by the absorption of the high intracavity optical power. The results show that feedback control is feasible to compensate the strong thermal lensing expected to occur in advanced laser interferometric gravitational wave detectors. Compensation allows the cavity resonance to be maintained at the fundamental mode, but the long thermal time constant for thermal lensing control in fused silica could cause difficulties with the control of parametric instabilities.
dc.description.sponsorshipThis research was supported by the Australian Research Council and the Department of Education, Science and Training and by the U.S. National Science Foundation, through LIGO participation in the HOPF.
dc.publisherAmerican Institute of Physics (AIP)
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/0034-6748..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 27/10/15). Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of Scientific Instruments and may be found at https://doi.org/10.1063/1.2982239
dc.sourceReview of Scientific Instruments
dc.subjectKeywords: Corundum; Error compensation; Feedback control; Fused silica; Lenses; Optical instruments; Optical testing; Sapphire; Silica; Cavity resonances; Cylindrical surfaces; Error signals; Fundamental modes; Gravitational wave detectors; Heating powers; Intra ca
dc.titleFeedback control of thermal lensing in a high optical power cavity
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume79
dc.date.issued2008-10-01
local.identifier.absfor020500
local.identifier.ariespublicationU3488905xPUB419
local.publisher.urlhttps://www.aip.org/
local.type.statusPublished Version
local.contributor.affiliationFan, Y, University of Western Australia, Australia
local.contributor.affiliationZhao, Chunjin, University of Western Australia, Australia
local.contributor.affiliationDegallaix, J, University of Western Australia, Australia
local.contributor.affiliationJu, Li, University of Western Australia, Australia
local.contributor.affiliationBlair, David Gerald, University of Western Australia, Australia
local.contributor.affiliationSlagmolen, Bram, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Department of Quantum Science, The Australian National University
local.contributor.affiliationHosken, David, University of Adelaide, Australia
local.contributor.affiliationBrooks, Aidan F, University of Adelaide, Australia
local.contributor.affiliationVeitch, Peter John, University of Adelaide, Australia
local.contributor.affiliationMunch, Jesper, University of Adelaide, Australia
local.identifier.essn1089-7623
local.bibliographicCitation.issue10
local.bibliographicCitation.startpage104501
local.identifier.doi10.1063/1.2982239
local.identifier.absseo970102
dc.date.updated2016-02-24T10:06:12Z
local.identifier.scopusID2-s2.0-55349084750
CollectionsANU Research Publications

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