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1、天津大學(xué)碩士學(xué)位論文寬帶光參量啁啾脈沖放大的研究姓名：劉華剛申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：物理電子學(xué)指導(dǎo)教師：章若冰20070101ABSTRACTTheopticalparametricchirpedpulseamplificationwasbornintheearly1990s．Becauseofitsuniqueadvantagesintheamplificationofultrashortlaser,greatattentionWaspaidafteritWasproposedforthefirsttime．
2、Severaladvantagesmakeitoneofthemostimportantamplificationtechniquesinultrashortlaser,whichareveryhighgainpersinglepass，highproportionofsignaltonoise，lowthermaleffectsandhighamplifiedsignalbeamquality．Theopticalparametricchirpedpulseamplifierscallampli母theult
3、rashortlaser,whiletheopticalparametricamplifiersshouldprovideenoughgainbandwidthaccordingly．Inthispaper，wesetasimulationmodel，whichcansimulatetheopticalparametricchirped·pulseamplificationpumpedbynon—homochromaticlightordivergedbeams．Wealsostudiedtheimpactof
4、divergenceangle，bandwidthandangularlydispersionofthepumponthegainandthegainbandwidthofopticalparametricchirpedpulseamplification．Accordingtoallkindsofeffect,severalmethodsandadvicesareproposedtoimprovethegainbandwidthofopticalparametricchirpedpulseamplificat
5、ion．Thesemethodsareveryusefulinstructiontoproducehigherintensityandshorterpulses．Theoutlineandinnovationofthispaperasfoliow：1)。．W-eretrospectthefundamental，advantagesandprogressofopticalparametricamplificationandopticalparametricchirpedpulsedamplification．2)
6、．Severaltechniquesofbroadbandphasematchedareintroduced，includingnon—collinearopticalparametricamplification，broadbandphasematchedwithangularlydispersedbeams，twobeamspumpedopticalparametricamplifierandSOon．3)．Anewschemeofopticalparametricamplificationispropos
7、edtoimprovethegainbandwidth，whichisopticalparametricamplificationpumpedwithdivergedbeams．Severalgaincurvesaresimulatedwhenthepumpisnon—diffractionlimitGaussianbeamorbeamofrectangulardistributioninspatialspectrumrespectively，usingthemethodofFouriertransforman
8、dthefourth—orderRunge-KuttaAlgorithm．Theresultsshowthatthegainbandwidthofopticalparametricchirpedpulseamplificationcanbeobviouslyimprovedusingdivergedpumpbeam，eitherinthevisibleorinthenearinfrar
