錳摻雜鈮酸鋰晶體的光致電荷輸運(yùn)過程和全息記錄研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文錳摻雜鈮酸鋰晶體的光致電荷輸運(yùn)過程和全息記錄研究姓名：張小齊申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)工程指導(dǎo)教師：劉友文20090301錳摻雜鈮酸鋰晶體的電荷輸運(yùn)過程和全息記錄研究iiAbstractNonvolatileholographicrecdinginlithiumniobatecrystalsdoublydopedwithFe:MnproposedbyBuseetal.isnotonlyapromisingm

2、ethodfopticallyfixinghologramsbutalsoanallopticalmethodfrecdingalocalvolumehologramsinphotefractivecrystals.InthiscontributionnearstoichiometriclithiumniobatecrystalsslightlydopedwithMnfromdifferentLiconcentrationsinthem

3、eltweregrownbythetopseededsolutiongrowth(TSSG)method.Thegetransptprocesswasinvestigatedbyprobingthelightinducedabsptionat780nmunder350nmUVpumpillumination.Thedarkdecayprocessoflightinducedabsptionshowsastretchedexponenti

4、albehavi.Thedependencesofthelightinducedabsptionthedecaytimeconstantthestretchingfactonthepumpingintensitywerepresented.ThephotovoltaiccurrentintensitythephotoconductivityunderUVilluminationweremeasuredbyapplyingaDCfield

5、alongthezaxisofthesample.Thephotoconductivitythephotovoltaiccurrentdensityshowedsuperlineardependenceonintensity.Theexperimentalresultscanbeexplainedquantitativelybydevelopingthetwocentergetransptmodelwithdirectexcitatio

6、nrecombinationbetweendopantsinternaldefectsthevaluesofparametersfacterizingmaterialsarepresented.InthiswkwealsosetupasetofcouplingdifferentialequationsthatdescribethedynamicsofthenonvolatileholographicrecdinginMndopedlit

7、hiumniobatecrystalsinthecaseofsmallsignalmodulationsimulatedthetimedynamicdevelopmentprocessesofholographicrecding.Keywds:photefractiveeffectnonvolatileholographicrecdingopticalfixinggetransptprocessstoichiometriclithium