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1、+PhotoreductionofAginaluminoborateglassesinducedbyirradiationofafemtosecondlasera)BinHuaDepartmentofMaterialChemistry,GraduateSchoolofEngineering,KyotoUniversity,Nishikyo-ku,Kyoto615-8510,JapanJianrongQiuPhotonCraftProject,ShanghaiInstituteofOpticsandFineMechanics,ChineseAcademyofSc
2、iencesandJapanScienceandTechnologyAgency,Kyoto619-0237,JapanYasuhikoShimotsuma,KojiFujita,andKazuyukiHiraoDepartmentofMaterialChemistry,GraduateSchoolofEngineering,KyotoUniversity,Nishikyo-ku,Kyoto615-8510,Japan(Received21September2004;accepted24November2004)+Wereportonphotoreductio
3、nofAginaluminoborateglassesinducedbyirradiationofafemtosecondlaser.Novelfluorescencewasobservedinthefemtosecondlaserirradiatedglasswhenexcitedbya365nmultravioletlamp.Opticalabsorption,emission,andelectronspinresonancespectraoftheglasssamplesdemonstratedthatafterthelaserirradiation,p
4、ortionsofsilverionsnearthefocusedpartofthelaserbeaminsidetheglasswerereducedtosilveratoms,whichresultedintheformationofthecharacteristicfluorescence.Theobservedphenomenonmayhavepromisingapplicationsinthefabricationoffunctionalopticaldevices.I.INTRODUCTIONHerein,wereportonacharacteri
5、sticfluorescenceex-citedbyaconventional365nmultraviolet(UV)lampinThepropertiesofnoblemetaldopedglasseshavebeen+Ag-dopedsoda-alumino-borateglassafterexposuretoextensivelystudiedbecauseoftheiruniqueopticalbe-afocusedfemtosecondpulsedlaser.Weobservedthehaviorssuchaslargethird-ordernonl
6、inearsusceptibility+0andultrafastnonlinearresponse.1,2Metalionornano-photoreductionoftheAgionstoAgatomsinglassbyfocusing120-fslaserpulsesthroughamicroscopeobjec-particledopedglassesareexpectedtobeapplicablema-tivelens.Wemeasuredopticalabsorption,emission,andterialsforthefabricationo
7、fopticalwaveguidesand34electronspinresonance(ESR)spectraoftheglassesbe-waveguidelasers,ultrafastall-opticalswitches,andop-5foreandafterlaserirradiation,aswellasafterfurtherticaldiskdatastorage.Inalltheseapplications,thecon-annealingatvarioustemperatures.Themechanismofthetrollableval
8、encestateandnanopar
