One ring to bind them all: linear and non-linear crystalline WGM resonators from THz to visible

Harald G. L. Schwefel

Max Planck Institute for the Science of Light地点:物理楼西412会议室

时间：2015年5月20日（周三）上午10:00-11:30

Highqualityopticalresonatorscanstorelightandthusenhancetheopticalfieldswithintheresonatorbymanyordersofmagnitude.Highinternalfieldintensitiesallowforefficientnonlinearprocessesandnarrowlinewidthresonancesareidealforprecisesensingapplications.AparticularlyinterestingresonatoristheWhispering-Gallery-Moderesonator,whichconfineslightbasedontheprincipleoftotal-internal-reflectioninanazimuthally-symmetricdielectric.Crystallinematerialsfeaturelowmaterialabsorptionaswellashighopticalnonlinearities,includingsecondordernonlinearities.IwillpresentMgF2resonatorsforbulk-indexsensingandshowhowhighlynonlinearLiNbO3resonatorscanefficientlyconvertmicrowavesintoopticalradiationHaraldG.L.SchwefelreceivedhisPh.D.intheoreticalphysicsfromYaleUniversityin2004.HehassinceworkedasapostdoctoralassociateatYaleandinJapan.AttheUniversityofErlangen-Nuremberghecompletedhishabilitationonthetopicof“crystallinewhisperinggallerymoderesonators”.CurrentlyheisagroupleaderofanexperimentalgroupwithinthedivisionofGerdLeuchsattheMaxPlanckInstitutefortheScienceofLightinErlangen,Germany.InSeptember2015hewillrelocatetothePhysicsDepartmentoftheUniversityofOtagoinDunedin,NewZealandasaseniorlecturerandestablishanindependentresearchgroup.Hiscurrentresearchinterestsarecrystallinewhisperinggallerymoderesonators,whichhestudiesinthemicrowave,THzaswellasintheopticaldomain.Heisespeciallyinterestedinnon-linearopticsandpolarizationwithinsuchresonators.

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