CPA系統(tǒng)中光束的測量、評價和改善.pdf

1、華東師范大學碩士學位論文CPA系統(tǒng)中光束的測量、評價和改善姓名：陸儉申請學位級別：碩士專業(yè)：光學指導(dǎo)教師：丁良恩20050501ABSTRACTAsultrahighintensityandultrashortlaserpulsehasanimportantapplicationinthefieldofsophisticatedandadvancedresearch，suchasX—raylaser，labcelestialbodies

2、physics，ICFlaserparticleacceleratorhigh—intensivefieldlaserphysicsandsoonithasbecomethefocusofrelatedresearchAndaschirpedpulseamplificationfCPA)isaneffectivemethodtogetthelaserwithultrahi【ghintensityandultrashortpulsewid

3、th，itdrawsglobalattentionMeanwhile，greaterimportanceisbeingattachedtothebeamqualitywhichreflectsthespatialcharacterofthelaserDuringstudyingforMaster’sDegree，theauthorundertookthetask。f“Detectiion，EvaluationandAmelioratio

4、nofLaserBeam1‘intheprojectof“5TW，20fsCPASystem”Thisdissertationisthesumming—upoftheauthor’sresearchandexperimentalworkThemaincontentsareasfollows：1Reviewedthehistoryofthedevelopmentofultra—shortlaserPulsetechnologyErnpha

5、ticallyintroducedtheprinciples，makeupandlatestprogressofCPAtechnology2Studiedthetheoreticalbasisofmeasuringthebeamqualityfactorbybeginningwiththe胛matteroflaserbeamSetupthealgorithmicmodleoffittingtheGaussianbeambymeansof

6、secondrankquadratureandnon]inearleastsquaremethodAnddesignedthemajorpartsofsoftwareinthebeamqualitydiagnosissystemwhichservesOUrCPAsystem3AmethodwhichuseshasicFouriertransformandlasermultimodetheories，andbymeansofnumeric

7、alintegrationwithreasonablymathematicalapproximation，todesignthesizeofthepinholeinthespatialfilterofaCPAsystemisstudiedInconclusiontheoptimaldiameterofthepinholeisabout693timesthediffraction1imitlengthThisresultiswellver