sbs百皮秒脉冲压缩特性的分析-analysis of pulse compression characteristics of sbs hundred picoseconds.docx

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sbs百皮秒脉冲压缩特性的分析-analysis of pulse compression characteristics of sbs hundred picoseconds.docx

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sbs百皮秒脉冲压缩特性的分析-analysis of pulse compression characteristics of sbs hundred picoseconds

较稳定；三者的最高SBS能量反射率在忽略反射损耗的条件下均可达到80%以上。从这样看来，FC-70压缩的效果要好于其他两种介质，更适合于SBS百皮秒脉冲压缩的产生。关键词：受激布里渊散射（SBS）；百皮秒脉冲压缩；SBS介质参数IIAbstractNowadaystheenergyresourcesarebecomingaproblemtobesolved.TheInertialConfinementFusion(ICF)isapotentialmethodtosolvethatcontradictionradically.Theshock-ignitionisawaytoachieveignitionproposedrecently.Buttheshock-ignitionneedshigh-energyhundredpicosecondslaserpulse.ThestimulatedBrillouinscattering(SBS)whichnotonlyhasadvantageinsimplestructure,low-costing,highefficiencyenergyconversionandhighpulsewidthcompressionratiobutalsocanimprovethequalityoflaserbeamwiththeconjugationpropertywhichcansupplythelaserpulse.Thisarticleinvestigatestheeffectoftheparametersofpump,structureandtheSBSmediumontheSBSpulsecompressionpropertiessuchascompressedpulsewidth,SBSefficiencyenergyconversionandstabilityofStokespulsewaveshapebymeansoftheoreticalanalysisandexperimentalvalidation.Finally,newSBSmediumswhichmakethemgoodcandidatesforgeneratinghundred-picosecondpulsewillbegivenout.Firstly,theMaxwellequationsandNavier-Stokesequationincludingthesecond-ordertimedifferentialofacousticfieldareusedtosetuptheSBSpulsecompressionmodelontheone-dimensionaltransientcondition.Byusingthediscretizationmethod,theiterativeschemeoftheopticalfieldandacousticfieldisalsodisplayed.ThedistributioncalculationmodeloftheeffectontheSBShundred-picosecondpulsecompressionpropertiesisachievedandthestabilityofmodelisdiscussed.Andthenthroughthecalculationmodelwestimulatetheeffectoftheparametersofpump,structureandtheSBSmediumontheStokescompressedpulsewidthandSBSefficiencyenergyconversionintheSBSprocess.Judgingfromthesimulationresults,theparametersofpumpandstructurehaveoptimumvaluesforonemedium.However,forthedifferentmediums,asthephononlifetimeislarger(typicallygreaterthan0.6ns),thephononlifetimeplaysleadingroleonStokespulsewidth.Onthecontrary,thephononlifetimetogaincoefficientratiowouldplayanimportantroleandthesmallertheratiois,thenarrowertheStokespulseis.Thennewmediumswiththepropertiesoflowerabsorption,hig