降温法生长KDP晶体的实验和数值模拟

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1、重庆大学硕士学位论文降温法生长KDP晶体的实验和数值模拟姓名：毛琨申请学位级别：硕士专业：工程热物理指导教师：李明伟20070420重庆大学硕士学位论文英文摘要ABSTRACTKDPcrystal，asonekindofnon-linealopticalmaterialwimgoodqualities，hasbeenappliedwidelytothehi曲technologyfieldssuchaslaserfrequencyconversion,elcctroopticalmodulation,opticswitchandSOon．Big—sizedKDPcrystalist

2、hepreferredmaterialforICF(thermalConfinemcmtFusion)，othermaterialswithbettercomprehensiveperformancecomparedwithKDPcrystalCannotbegaineduptillnow．Becauseofitsspreadingusageinthesefields，morehigh—qualityKDPcrystalisurgentneeded．WiththedevelopmentofICFtechnology,USAprohibitstheexportofrelativet

3、echnologyandmaterials．Intheinternationalmarketsthebig—sizedandhigh-qualityKDPcrystalfallsintoshortofsupply．ThefocusoftheresearchonKDPcrystalinrecentyearsistryingtoincreaseKDPgrowthrate，shortenitsgrowthcycleanddecreaseitscostatthepreconditiontoassuringitshi曲opticalquality．Themethodoftemperatur

4、ereductionistheusualmethodofKDPcrystalgrowth．Itisveryimportantmaintainingarlappropriaterateoftemperaturereductioninorderthatthesolutionisstayinginmetastablezoneduringtheperiodofgrowth．So，intheprocessofcrystalgrowth，allappropriatesupersaturationofthesolutionneededbeconsideredpivotally．Inthispa

5、per,thefollowingresultshavebeenobtainedbyKDPcrystalgrowthexperimentsandnumericalsimulation．Theimtialtemperatureofsolutionandrateoftemperaturereductionhaveeffectsonthequantityandrateofcrystalgrowth．Solventevaporationwillaccelerategrowthbutloweritsquality．Sothevesselofgrowthsolutionshouldenable

6、closed，growthsolutionshouldbecontrolledappropriatelybytherateoftemperaturereduction．Thestabilityandpurityofthegrowingsolutionhavemorenotableinfluenceongrowthrateandquailty．ThepHvalueofthegrowingsolutionchangesthemorphologyofthegrowncrystal．pH=4．5istheappropriatevalueforKDPcrystalgrowthfromsol

7、ution．Thedistributionofcrystalsurfacesupersaturationtrendsgraduallydecreasedfromtheedgetothecenterpositionofthecrystal．Onthesalneconditions，supersaturationwillbelowerwiththegrowthrateincreasingandsupersaturationwillbeincreasedwiththerotations