近化學計量比鈮酸鋰晶體電光性能的研究.pdf

1、南開大學碩士學位論文近化學計量比鈮酸鋰晶體電光性能的研究姓名：劉宏德申請學位級別：碩士專業(yè)：凝聚態(tài)物理指導教師：許京軍孔勇發(fā)20040518南開大學碩士學位論文AbstractLithiumniobate(LiNb03)isarlexcellentsyntheticcrystal，whichhasmanyimportantproperties，suchaselectrooptic，acousto—optic，thermaloptic，p

2、iezoelectricandphotorefractiveeffects，etc，Inthelastfewyears，manynewtechniquesandstudiesrelativetolithiumniobatecrystalsdevelopedandbecamehotspots，forinstance，thenonvolatileholographicrecording，thequasiphasematchingperiod

3、icallypoledlithiumniobate(PPLN)wavegenerationandcontrolatTHzwaveAndmostimportantlybecauselithiumniobatecrystalsplaysasignificantroleinIntegrateoptics，ithasbeenconsideredasapromisingcandidatefor‘‘OpticalSilicon”materialHo

4、weverthecrystalweusuallyusediscongruent，whichhasaplentyofintrinsicdefectsMoreandmoreexperimentsresultsindicatethattheseintrinsicdefectsdegradethephysicalcharacteristiesofcrystalsWiththeincreasementoftheLi20contentthereis

5、agreatenhancementonsomecharacterizationsoflithiumniobatecrystalsInthispaper，weinvestigatedtheelectro—opticalcharacteristicsofnear—stoichiometriclithiumniobatecrystalsInchapterone，wegenerallyintroducedthebackgrotmdandobje

6、ctiveofthisworkInchaptertwo，weintroducedthefabricatingprocessofthenearstoichiometriclithiumniobateplatesindetml，especiallytheprocessof3inchwafersandbatchprocessofplatesInchapterthree，weinvestigatedthephotorefractiveresis

7、tantcharacteristicsofthenearstoichiometriclithiumniobatecrystalsdopedwithMgTheyCanwithstandlightintensityashighas26堿|矗whichismorethan6orderslargerascomparedwiththatofcongruentonesInchapterfour，weinvestigatedthephotoreffa

8、ctivepropertiesofnear—stoichiometriclithiumuiobatecrystalsdopedwithFeTherespondingtimeinnearstoichiometricimndopedlithiumniobatecrystalsisahalfsmallerthesensitivityisenhanced23times，andcouplingcoefficientis3～4timeshigher

9、thanthatofcongruentonesTherespondingtimeinnearstoichiometricCO—dopedlithiumniobatecrystalshasseveralsecondsInchapterfive，weinvestigatedthefluorescenceintensityofnearstoichiometriclithiumuiobatecrystalsdopedwithErTheemiss

10、ionintensityofEr3innearstoichiometriclithiumniobateCO—dopedwithMgandEris72timeshigherthanthatofthecongruentoneKeywords：lithiumniobate，nearstoichiometry，VTE(vaportransmittanceequilibration)，photorefractiveresistance，photo