宽带光参量啁啾脉冲放大的研究

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1、天津大学硕士学位论文宽带光参量啁啾脉冲放大的研究姓名：刘华刚申请学位级别：硕士专业：物理电子学指导教师：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