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超短脉冲强测量.pptx

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1Ultrashortlaserpulsesaretheshortesttechnologicaleventsevercreatedbyhumans.Todeterminethetemporalresolutionofanexperimentusingit. Todeterminewhetheritcanbemadeevenshorter. Tobetterunderstandthelasersthat emitthemandtoverifymodels ofultrashortpulsegeneration. Tobetterstudymedia:thebetter weknowthelightinandlight out,thebetterweknowthe mediumwestudywiththem. Tousepulsesofspecificintensity andphasevs.timetocontrol chemicalreactions:“Coherentcontrol.” Tounderstandpulse-shapingefforts fortelecommunications,etc. Becauseit’sthere.Exp’tAlaserpulsehasthetime-domainelectricfield:tddtPulseMeasurementintheTimeDomain:DetectorsPulseMeasurementintheTimeDomain:VaryingthepulsedelayWecanalsovarythedelayusingamirrorpairorcornercube.Okay,sohowdowemeasureapulse?PulseMeasurementintheTimeDomain:TheIntensityAutocorrelatorSingle-ShotAutocorrelationSingle-ShotAutocorrelationSingle-ShotAutocorrelationofLongerPulsesPracticalIssuesinAutocorrelationSquarePulseandItsAutocorrelationGaussianPulseandItsAutocorrelationLorentzianPulseandItsAutocorrelationAutocorrelationsofmorecomplexintensitiesAutocorr2Autocorrelationsofcomplexpulses:firstconsideradoublepulseAutocorrelationofVeryComplexPulsesPulseMeasurementinBothDomains:CombiningtheSpectrumandAutocorrelationAmbiguitiesinTIVI:PulseswiththeSameAutocorrelationandSpectrumAmbiguitiesinTIVI:MorePulseswiththeSameAutocorrelationandSpectrumWhenashorterreferencepulseisavailable:TheIntensityCross-CorrelationPulseMeasurementintheTimeDomain:TheInterferometricAutocorrelatorInterferometricAutocorrelationMathTheInterferometricAutocorrelationisthesumoffourdifferentquantities.InterferometricAutocorrelationandStabilizationInterferometricAutocorrelation:ExamplesDoestheinterferometricautocorrelationyieldthepulseintensityandphase?PulseswithVerySimilarInterferometricAutocorrelationsPulseswithVerySimilarInterferometricAutocorrelationsMorePulseswithSimilarInterferometricAutocorrelationsMorePulseswithSimilarInterferometricAutocorrelationsInterferometricA