频率分辨光学开关法的原理与应用

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1、AbstractAbstractThedevelopmentofultra-shortlasershasprogressedrapidlytheseyears．However,inmostpracticaluseonlyhavetheultra-shortlasersisfarfromenough，weneedtoknowthepulses’timedomaincharacterizationwhichmeansweneedtomeasuretheultra-shortpulses．Thetraditionaltechnologies，suchasintensityautocorrelatio

2、n，canonlygetpartialinformationaboutthepulses．Recentlyanimportanttechnologyhasbeendeveloped．ItiscalledFrequencyResolvedOpticalGating(FROG)．AnditCanmeasuretheentirefieldofultra-shortpulsesincludingtheintensityandphase．Inthisthesiswefocusonthetheoreticalandexperimentalresearchonfrequencyresolvedoptical

3、gatingaccordingtotherecentdevelopmentsandthepracticalconditionofthelaboratory．Themain。partsareasfollows：1．Introducethebasictheoryoffrequencyresolvedopticalgatingandthedifferentkindsofitaccordingtothedifferentbeamgeometries，whicharecalledPolarization-GateFROG(PG-FROG)，Self-DiffractionFROG(SD-FROG)，Se

4、cond-Harmonic·GenerationFROG(SHG—FROG)．删rd—Harmonic·GenerationFROG(THG—FROG)．Moreover,theadvantagesanddisadvantagesofdifferentkindsofffequencyresolvedopticalgatingarediscussed．2．DescribethreefrequencyresolvedopticalgatingalgorithmswhicharevanillaFROGalgorithm，generalizedprojectionsFROGalgorithmandpr

5、incipalcomponentgeneralizedprojectionsFROGalgorithm．WecomparethevanillaFROGalgorithmandtheprincipalcomponentgeneralizedprojectionsFROGalgorithmbynumericaltestingaseriesofknownpulses．Throughthis，wefindoutthevanillaFROGalgorithmCanbeaffectedbytheinitialguessespeciallytosecondharmonicgenerationfrequenc

6、yresolvedopticalgating．Improperinitialguessmayleadthefailureofthealgorithm．However，theprincipalcomponentgeneralizedprojectionsFROGalgorithmismoresuitabletosecondharmonicgenerationfrequencyresolvedopticalgating．Itsucceedsingivingtherightoutcomefromallthetestingpulses．3．Describethebasictheoryofauto—co

7、rrelator．Weusebasicopticalcomponentstobuildanauto．．correlator．Thebasicparametersoftheauto．．correlatorandthedetailsIIIAbstractofadjustingthebeamgeometryarediscussed．Weusethisauto-correlatortomeasureall