掺杂ZnWO4激光晶体的生长与光谱性能研究

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1、哈尔滨理工大学硕士学位论文掺杂ZnWO<,4>激光晶体的生长与光谱性能研究姓名：张钦辉申请学位级别：硕士专业：应用化学指导教师：刘波20080601哈尔滨理工大学工学硕士学位论文子在中心位于474nm、572nm．的上转换荧光以及Eu3+离子在中心位于613nm处的荧光强度明显增强，并根据能级结构对它们之间的能量转移的具体过程进行了解释；研究中还发现Ce3+离子对Nd3+离子的敏化效果比对Eu3+离子的要明显许多，分析原因可能是Ce3+离子的5d能级和Eu3+离子的5Do能级差较大，使能量转移效率不高造成的。关键词ZnW04激光晶体；晶体生长；光谱性能；J．O理论：敏化作

2、用-II-哈尔滨理工大学工学硕士学位论文StudiesonGrowthandSpectralPropertiesofDopedZnW04LaserCrystalsAbstractLasercrystalmaterialsaremoreandmoreusedinmilitaryaffairs，industry,medicaltreatmentandscientificresearch，andSOon．Withthedevelopmentofscientifictechonology,higherqualitiesoflasercrystals，suchasbroadabso

3、rptionlineandlongfluorescencelifetime，arerequired．HighqualityZnW04crystalsareeasilygrown，andproperlystudiedaslaserhostcrystalsbecauseofgoodchemicalstabilityandradiationresistance．Inthispaper,thesuitabletemperaturefield，growthrateandrotationrateofthecrystalsweredecidedbyamountofexperiments

4、andtheoryanalysis．AseriesofdopedZnW04lasercrystalsweregrownbyCzochralskimethod，containingseriesofEu：ZnW04，Nd：ZnW04andTm：ZnW04lasercrystals．Andthen，allthecrystalswereoriented，cutandpolishedintosamples．ThecrystalstructuresofdopedZnW04crystalswerecharacterized．AccordingtotheresultsofX·raydif

5、fractionspectrum，crystalstructuresofdopedZnW04crystalsdidn’tchange．Thedefectionsystemof{2[Rzn】十一陬n】小}formedbydopingCe3+，Nd3+andEu3+intocrystallattices，inwhichCe3+，Nd3+andEu3+ionsCanreplacetheZn2+andvacantdefectsofzn2+cankeepthebalanceofcharge．AccordingtotheabsorptionspectrumofCe：ZnW04，WeC

6、andrawtheconclusionthattheabsorptionpeak。whichiScorrelativewiththetransitionsof5d_4fofCe3+，Wasstrongandbroad，andtheabsorptioncrosssectionislarge．Forexample．theabsorptioncrosssectionofCe：Eu：ZnW04canachieve1．34x10。16cnr．SoCe”ionsCanabsorbpumppowereffectively，whichmeatrequirementofsensitivei

7、ons．TheJudd—OflettheoryWasdescribeddetailed．AccordingbyJudd-OflettheoryandabsorptionspectrummeasurementresultsofNd：ZnW04，theintensityparametersofNd3+ionsinNd：ZnW04crystalwerecalculatedtobeQ2=6．8202x10"20cm2，fh=o．4633x10"20cm2and‰=0．4435x10"20cm2，whichare．．III．．ve巧1m