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1、December1,2000/Vol.25,No.23/OPTICSLETTERS1693High-frequencyBragggratingsinaphotothermorefractiveglassO.M.Efimov,L.B.Glebov,andV.I.SmirnovSchoolofOptics/CenterforResearchandEducationinOpticsandLasers,UniversityofCentralFlorida,P.O.Box162700,Orlando,Florida32816-2700ReceivedJu
2、ly21,2000HolographicUVmirrorswererecordedinavolumeofphotothermorefractiveglass.Thisphotosensitivesili-categlassdopedwithsilver,cerium,andfluorineistransparentinthenear-UV,visible,andnear-IRspectralregions,anditsinducedrefractive-indexchangereaches1023.UVradiationofaHe–Cdlase
3、rat325nmwasusedforBragggratingrecordingwithaspatialfrequencyof9200mm21.Theabsolutediffractionefficiencyoftherecordedmirrorreached12.6%at325nmanddidnotdeteriorateunderthelong-timeeffectsofopticalirradiationandheatingup400±C.©2000OpticalSocietyofAmericaOCIScode:090.7330.Oneof
4、theimportantparametersforholographicme-tatedinthedevelopmentprocesswouldrestrictrecord-diacharacterizationisthemaximalspatialfrequencyingofhigh-frequencygratings.Thus,thegoalofthisthatcanberecordedinthesematerials,becausestudywastocheckonthepossibilityofrecordingaUVthisparam
5、eterdefinesthequalityoftherecordedBraggmirror,i.e.,ahigh-frequencyreflectivegrating,patternandthecutoffwavelengthofholographicinPTRglass.1,2mirrors.SuchmirrorscanbeusedfordesignHighly-homogeneousPTRglasssampleswithaofanarrow-bandfilterthatshouldhaveahigherthicknessof1mmwere
6、cutfromaslabthatwasspectralselectivitythanconventionalinterferencesynthesizedbyuseoftechnologydescribedinRef.10.filters.Forexample,anarrow-bandmirrorwithAsingle-transverse-mode1-mWHe–Cdlaseratspectralselectivityof0.0125nmatawavelengthof325nmwasusedintheexperiments.Thiswave-6
7、56.28nmwasrecordedinan8-mm-thicklithiumlengthisinthemiddleregionofglassphotosensitivity3niobatecrystal,whichisknownasoneofthebest(280–370nm).Wepassedthelaserbeamthroughamaterialsforphasehologramrecording.However,spatialfiltertoexcludethenoisefromtheintensitythismaterialhasre
8、strictedapplicationsinthedistribution.Weexposedasampletoaninterferencevisib
