SpectralHoleBurningandPhoto-StimulatedLumine scenceProcessesinBaF(Cl,Br):Sm~(2+)SongHong wei(宋宏伟);ZhangJiahua(张家骅);LuShaozhe(吕少哲)Sun Lingdong(孙聆东);HuangShihua(黄世华);YuJiaqi(虞家祺) (LaboratoryofExcitedStateProcesses,Changchu nInstituteofPhysics,AcademiaSinica,Changcha n130021,China)ReceivedJuly12,1995Abstract:B eforeandafterX-irradiation,twophotonspectra lholeburningexperimentsinBaF(Cl,Br):Sm2+wer eperformedbya560nmlaserlightatliquidnitroge ntemperature.Theresultsshowthatspectralhole burningofSm2+dopedfluoridehalidemixedcrysta lsareaccompaniedbyphotostimulatedluminescen ceprocess.Thisprocessmakeholeburningefficie ncydecreased.Keywords:Spectralhole-burning, Photo-stimulatedluminescence,ColorcenterSin cephotongatedspectralholeburninginBaFCl:Sm2 +wasreportedbyA.Winnakeretal.[1].Sm2+dopedf luoridehalidemixedcrystalshavebeenfoundtobe abettermaterialsfortheirusefulproperties.Es pecially,theyhavegoodpropertiesinhightemper atureholeburning.Roomtemperatureholeburning havebeenrealizedatpresent[2~4].Thesemateria lshavepotentialuseinfrequencydomainopticals torage,andthereforetheyarewidelyinvestigate d.ThehostlatticeofthesecompoundsbelongstoPb FXsystem,whichisabetterhostfordivalentraree arthions.DivalentrareearthionsdopedinPbFXsy stemhavemulti-characteristics.Besidesbeingh oleburningmaterials,theyarealsophoto-stimul atedluminescencematerials,thermalstimulated luminescencematerials,X-rayluminescencemate rialsandUVphoto-luminecencematerials[5~7].S tudiesinthisfieldwereperformedearlier.SuMia nzengetal.studiedsystematicallyinthefieldfi rst.Photo-stimulatedluminescenceprocessesar esimilartospectralholeburning[8]tosomeexten tandthesetwoprocessesexistsimultaneouslyint hesamesample.Therefore,westudiedphoto-stimu latedluminescenceprocesssoastoincreaseholeb urningefficiencyandclarifyholeburningmechan ism.Wefoundthatholeburningprocessisaccompan iedbyphoto-stimulatedluminescenceprocess,wh ichmakesholeburningefficiencydecrease.Inthi spaper.holeburningmechanismisalsostudied.1E xperimentalTheBaF(Cl,Br):Sm2+powdersamplesw erepreparedasthemethoddiscribedinreference[ 9].Inexperimentsofspectralholeburningandpho to-stimulatedluminecencethesampleswerepumpe dandprobedbyaNd:YAGlaserattheliquidnitrogen temperature.AD330monochrometer,aBoxcaravera ger,andaDatematecomputerwereusedtodetectand analysetheluminescenceofBaF(Cl,Br):Sm2+.Bef oreexperiments,aD-maxX-raydiffractometerwas usedtoirradiateoneofthesamples.2ResultsandD iscussion2.1Spectralholeburningbeforeandaft erX-irradiationOnthesamplesbeforeandafterX- irradiation,twophotonspectralholeburningexp erimentswereperformedbya560nmNd:YAGpulsedla serunderthesamecondition.Fig.1showsthedepen denceofthefluorescenceintensityataburningsi teonburningtimeinthesamplesbefore(1)andafte r(2)X-irradiation.Inexperimentsthesampleswe reexcitedwiththesamelaserpower,andirradiati onareaswereall1cm2.Thelightpathwasunchanged .FromFig.1wecanseethatbeforeandafterX-irrad iation,thedependenceofthefluorescenceintens ityattheburningsiteonburningtimechanged.Ast othesampleafterX-irradiation,thefluorescenc eintensitydecreasedwithtimemorequickly.This resultshowsthat:(1)ByX-irradiation,theelect roncapturingabilityoftrapsandholeburningeff iciencyareenhancedpossiblysothatholedepthis deepenedwithburningtimemorequickly.(2)Photo -stimulatedluminescenceprocesshappensasthes ampleisexcitedbythe560nmlaserbeam.Thepopula tionsofFcenterincreasegreatelybyX-irradiati onsothatphoto-stimulatedluminescenceprocess isincreased.Duetothatphoto-stimulatedlumine scenceintensitydecaysfasterthanburningrate, thefluorescenceintensityafterX-irradiationd ecreaseswithtimemorequickly.Figs.2and3showd istributionsoftheexcitationspectrumbeforean dafterX-irradiationrelatedtoFig.1respective ly.WecanseefromFig.2thatastothesamplebefore X-irradiation,aholeabout50%depthisobtaineda fterburning.FromFig.3wecanseethatastothesam pleafterX-irradiation,noobviousholeisobtain edafterholeburning.Theseresultsshowthateffi ciencyofholeburningbyX-irradiationdecreasegreatly.SothechangeoffluorescenceintensityattheburningsiteinFig.3ismainlyattributedtothechangeofphoto-stimulatedluminescenceproces
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