高功率激光器中頻波段傳輸特性研究.pdf

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3、dshiglltemperaturesanddensitiesreliedonhighpowersolidstatelaserdrivertoachievethefusionreactionconditions，soitrequiresoutputgoodbeamqualityInordertoensurehighharmonicconvemionefficiencyandgettingthroughthepin—llolethebea

4、mmusthavegoodnearfielddistributionuniformityandwavefontInthesimilarNIFdevice，Iargeapertureelectroopticalswitchl①Pcrystalactingasakeycomponentofthefourpassamplifierduetoitsmaterialpropertiesandprocessingmethodswillintrodu

5、cealotofmiddleandhi曲frequencyinformationCombinedwithwavecontrolmethodsinthedeviceitcanbeanalyzedthatsomeofitsfrequencycangetthroughthepinholeandcan’tbecorrectedbydeformablemirror111emiddlefrequencywavefronthasagreatimpac

6、tonnearfieldintensityuniformityandfarfieldfocusingabilitythuslimitsthecapabilitiesofthesystemloadInordertoanalyzetheeffectsofthemiddlefrequencywavefront，thepapercarriesoutthefollowingjobs：Firsttostudythecurvedmodulationi

7、nthenearfielddatacolleeredbyCCDintheexperimentsfilteringanalysisonthetypicalNd：glassandKDPcrystalisdonetofindoutthatthereareresidualperturbationwhichhaveaperiodof20mmontheKDPcrystalAccordingtothewavefrontspacebanddivisio

8、nandlaserdevicesystemcharacteristicscomparethedataofthe33mmhighpassfilteringontheopticalcomponentswithNIFstandardcurveandhaveageneraliudgmentonthemodulationcardedbyKDPcrystalcontributingtothefmaloutputofthesystemSecondac

9、alculationmodelwhichisbasedonFFTtheoryanopticswavefrontdataofSGIIisestablishedand，getdifferentnearfielddistribufionsinthreecases：withmiddleandhi小frequenciesintroducedbyKDPcrystal；withoutl①Pcrystal；withtheincreasedmiddlea

10、ndhighfrequenciesmodulationItcanbefoundthatbecausetheKDPcrystalhasamuchhigherpowerspectraldensitytheotheropticalelementsinmiddlebandfrequency，asimilarperiodicdistributionofintensityinnearfieldcanbefoundandthecontrastofth

11、enearfieldwillbesignificantlyincreasedandtheuniformitywillgetworsewhentheperturbationincreases111irdintroducethe‘spatialcoordinatetransformationmethod’whichisusuallyusedinshortwaveandshortfocallengthsystemtocalculatefarf

12、ieldfocalspotunderthelargeapertureandlowsamplingratecaseSimulatethefarfieldfocalspotsindifferentspatialfiltersindifferentcasesandgetthemiddle—frequencyperturbationwhichcangetthroughthepinholeimpactonthesizeofthefocalspot

13、Atlast。intheparaxialapproximation，waveequationinnonlinearmediacanbederivedbasedonMaxwell’sequationsCalculatethefastestgrowthfrequenciesindifferentpropagationintervalaccordingtoBTtheoryEstablishthephasedefectsmathematical

14、expressionandanalyzeitspropagationinnonlinearmedia，calculatetheamplitudegrowthofdifferentdefects’size，thusabasicunderstandingonlocalizedwavefrontdefectsinICFlaserdevicecanbegotKeywords：highpowerlaserdeviceKDPcrystal，spat