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光反馈光腔衰荡和脉冲光腔衰荡技术测量腔镜高反射率的对比研究(英文).docx

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光反馈光腔衰荡和脉冲光腔衰荡技术测量腔镜高反射率的对比研究(英文) AComparativeStudyofOpticalFeedbackCavityDecayandPulsedCavityDecayTechniquesforMeasuringHighReflectivityofCavityMirrors Abstract: Themeasurementofhighreflectivityofcavitymirrorsisofgreatimportanceinvariousapplications,suchasgravitationalwavedetectionandlasercavitydesign.Inthisstudy,wecomparetwowidelyusedtechniques,namelyOpticalFeedbackCavityDecay(OFCD)andPulsedCavityDecay(PCD),tomeasurethereflectivityofcavitymirrors.Bothtechniquesrelyonmonitoringthedecayofthelightintensitywithinthecavityovertime. Introduction: Thereflectivityofcavitymirrorsisafundamentalparameterthatdeterminestheperformanceofopticalcavities.Themeasurementofhighreflectivityischallengingduetothetypicallyhighfinesseofthecavities.Severaltechniqueshavebeendevelopedtoaccuratelymeasurethereflectivity,includingOFCDandPCD.OFCDisbasedonthefeedbackofthecavityoutputtotheinput,whilePCDinvolvesinjectingshort-durationpulsesintothecavityandmeasuringthedecaytime. ExperimentalSetup: TheexperimentalsetupforbothOFCDandPCDtechniquesconsistsofalasersource,acavitywithhighreflectivitymirrors,andaphotodetector.InOFCD,afractionofthecavityoutputisfedbacktothelasersource,creatingaself-feedbackloop.InPCD,short-durationpulsesareinjectedintothecavity,andthedecaytimeismeasuredusingthephotodetector. ResultsandDiscussion: Thereflectivitymeasurementsusingbothtechniqueswereperformedonahighfinesseopticalcavity.OFCDprovidedacontinuousdecaycurve,whilePCDresultedinaseriesofdecayingpulses.Bothtechniquesgaveaccurateestimatesofthereflectivity,butwithslightlydifferentcharacteristics.OFCDprovidedacontinuousmeasurement,whichallowedforamoreprecisedeterminationofthedecaytime.PCD,ontheotherhand,providedaseriesofdiscretedatapoints,whichallowedforamoredetailedanalysisofthedecaybehavior. AdvantagesandLimitations: OFCDhastheadvantageofprovidingcontinuousdecaycurves,whichallowforamoreprecisedeterminationofthedecaytimeandabetterestimationofthereflectivity.Italsohastheabilitytomeasureextremelyhighreflectivitymirrors.Howev