Optical and structural characterization of Crystalline Oxides for laser application.pdf

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1、UNIVERSITÀDEGLISTUDIDICAGLIARIDOTTORATODIRICERCAINFISICA–XIXCICLOOPTICALANDSTRUCTURALCHARACTERIZATIONOFCRYSTALLINEOXIDESFORLASERAPPLICATIONSDocenteguida:Dottorando:Prof.AlbertoAneddaDanieleChiriuSettoreScientificoDisciplinareFIS/01ContentsIntroduction1I

2、.1MaterialrequirementforLaserHostsandActiveIons1I.2Principalpurposeofthestudy41.Growthmethodandanalyzedsamples71.1Crystalpulling:theCzochralskimethod71.1.1.Introductiontothecrystalpulling71.1.2.Themelt91.1.3.Seedingandchamberambient10-1.1.4.Theroleofhyd

3、roxylimpurity(OH)duringthe11growth1.1.5.Pull,rotatingratesandfluxconvection131.2Samplesandtheirapplications151.2.1.NeodymiumdopedYAG:themostwidelyused15lasermedium3+1.2.2.FedopedYAGcrystals251.2.3.MixedGarnetlasersforWaterVapourDIAL26Transmitter1.2.4.Mi

4、xedcrystalswithYAG-YSGGcomposition28References302.Vibrationalpropertiesofgarnetstructure322.1Elementsofgrouptheory322.2TheOhpointgroupsymmetryandCharacterTable352.3Hostmaterialswithgarnetstructure37References413.CrystallineFieldandelectron-phononcouplin

5、g423.1Crystal-Fieldsplittingofenergylevels423+3.2EmissionofReionsinLaserCrystals473.3Electron-phononinteractions513.4Sensitized-Crystalslaser56References59iContents4.Experimentalresults:YAG-YSGGmixed60structures4.1Vibrationalpropertiesof(YAG)x-(YSGG)1-x

6、crystals604.1.1.Experimentalsetupandgrowthconditionof60analyzedsamples4.1.2.Resultsanddiscussion614.2Compositionaltuningofphotoluminescencepropertiesin72Nd-dopedYAG-YSGGmixedstructures4.2.1.Experimentalsetup724.2.2.Resultsanddiscussion72References843+5.

7、Experimentalresults:FedopedYAG855.1Electron-phononcouplinginIrondopedYttrium85AluminumGarnet5.1.1.Experimentalsetupandgrowthconditionof85analyzedsamples5.1.2.Resultsanddiscussion86References97Conclusions98Complementaryresearchactivities101ListofPublicat

8、ions102iiIntroductionAlthoughlaseroperationhasbeendemonstratedinawidevarietyofmaterials,onlyaveryfewtypesofsolid-statelaserhavebeendevelopedforresearchand/orcommercialapplication.Inmanycasesthedevelopmentofaspecifictypeoflaserhas