Dynamic modulation of an ultrashort high-intensity laser pulse in matter超短强激光脉冲在物质中的动态调制

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1、Dynamicmodulationofanultrashorthigh-intensitylaserpulseinmatterA.V.BorovskiiInstituteofGeneralPhysicsoftheRussianAcademyofSciences,117942Moscow,RussiaMV:KeldyshAppliedMathematicsInstituteoftheRussianAcademyofSciences(Submitted22April1993)Zh.Eksp.Teor

2、.Fiz.104,3311-3333(October1993)Thetime-dependentspatiallytwo-dimensionalproblemoftheself-channelingofahigh-powerultrashortlaserpulseinmatterissolved.Therelativisticandponderomotivenonlinearitiesaretreatedforfreeelectrons,withtheionsassumedtobeatrest.

3、Thenoveltyofthemodelconsistsinincludingthelongitudinalcomponentoftheponderomotiveforcefortheelectronsalongwiththewaveinteractionbetweenneighboringtransversesegmentsofthepulse.Thetwo-dimensionalcalculationsarevisualizedasasequenceof"snapshots"ofthepul

4、seasawholeatdifferenttimes.Intheprocessofnonlinearpropagation,strongdynamicmodulationofthespatialshapeofthepulseinthedirectionofpropagationisobserved,whichcausesthespectrumtobroaden.Atthepresenttimetheinteractionofultrashort(r<1binedrelativistic-pond

5、eromotivenonlinearityeffectsonps)high-power(P>10''W)pulsesfromexcimer'andpropagatingcircularlypolarizedradiationwasfirstob-neodymium2laserswithgaseousmediaisbeingstudiedtainedinRef.8.Theeffectsofself-modulationofthespec-activelybothexperimentallyandt

6、heoretically.OneofthetrumofscatteredradiationwhenapicosecondlaserpulseimportantdirectionsofthisresearchisthestudyofthepropagatesinanonlinearmediumwerereportedinRefs.propagationofintenselaserpulsesinthenonlinearplasma9-11.Amorecompletebibliographyofpa

7、personnonlin-mediumformedbythepulsesthemselves.Whenalaserearpropagationofhigh-powerlaserradiationinmatterpulseisfocusedinlightgases(H2,He,N2,C02,...),nearlyandonrelatedtopicscanbefoundinseveralreviewcompleteionizationofthegasatomsoccursattheleadingar

8、ticle^'^-'^andalsointwopapersbyBorisovetal.15,16edgeofthepulse.UndertheseconditionsrelativisticandTherelativistic-ponderomotiveself-channelingoful-ponderomotivenonlinearitiesarepresentandtheKerrtrashorthigh-powerlaserpulsesinplasmaisaphysicalef-nonli