铌酸锂晶体光致吸收的研究

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1、西南大学硕士学位论文铌酸锂晶体光致吸收的研究姓名：孔世江申请学位级别：硕士专业：光学指导教师：张耘20100401西南大学硕士学位论文AbstractResearchonlight-inducedabsorptionofLith-iumNiobateMasterofOptics：KongShijiangSuoervisor：AssociatePrefessorZhangYunssociatereIessorUnAbstractLithiumniobateiSoneofthemostimportantcrystallinematerialsfornonlinearopticalapplicat

2、ionofallkinds．Itisutilizedinlasers，electro-optic，acousto—optic，andopticalstoragedevices．Preciseknowledgeofthelight—inducedchargetransportgovernedbydefectcentersofLNisallindispensableprerequisiteforanyoftheseapplications．Light-inducedabsorptionexperimenthasbeenusedtostudytheelectronictransfermechani

3、smofelectro—opticalcrystal(suchasLi．Nb03，KNb03，andBaTi03)．Thelight-inducedabsorptionknowledge，ontheonehand,Canprovideaninsightintothemechanismofthelight-inducedchargetransportprocess．Ontheotherhand,itcanofferconsiderableguidancetorecordadesiredhologramfortheapplicationinformationstorageorintegrated

4、optics．Nowresearchonthelight-inducedabsorptionofthelithiumniobatealmostfocusonreduced,dopedlithiumniobate，andthegrowthstateofnear-stoichiometriccrystalandstoi—chiometriccrystalslackofconcem,thebasisofthecorrespondingcarriermobilitymodelhasnotyetestablished．ThePolaronofLithiumniobateplaysallimportan

5、troleinthecartiertransportprocesses，whichisasthedonororaccepterofelectroninthecrystal．Studyaboutpolaronisalmostaimedatbipolaronandboundsmallpolaron，atthesametimethereportsaboutholepolaron，freesmallpolaron，andQ-polaronisfew．Basedontheaboveviewpoints，Themainworkinthispaperincludes：1、Completelysummari

6、zesthefactorswhichinfluencetheconcentrationofbipolaron，smallpolarons，andfleesmallpolaronaswellastherelationbetweentheconcentrationofpolaronsandthelight—inducedabsorption；2、Studyonlight-inducedabsorptionoflithiumniobatecrystalswithdifferentcom—ponents，andanalysistheresults．Theoreticalanalysisandexpe

7、rimentalresultsindicatethatthediscussionaboutthechargetransfermechanismoflithiumniobateafterpulsedilluminationshouldincludeso-holepolaron．Themechanismsaredicussedondifferentproposedbandschemeinthispaper．Key