双脉冲飞秒激光诱导表面微纳结构的超快动态特性分析

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1、AbstractInrecentyears，withtherapidandmaturedevelopmentoftheultrashortpulsedlasertechnologyandthewidespreadapplicationsofcommerciallaserproduct，femtosecondlaserpulse，asanewtoolforthemicro／nano·machining，isattractingmoreandmoreattentions．Sofarithasbeensuccessfullyappliedinthepro

2、cessing，repairing，andmodifyingtheoutersurfaceandinteriorofmaterialsonthemicro／nanoscales，suchasmetals，semiconductorsanddielectricmedia，andsolvedsomekeytechnologicalproblemsinthepracticalapplications．Comparedwithtraditionalhyperfinemachiningtechnology,femtosecondlasermicromaehi

3、ninghasseveraladvantagesofthedirectwritingoperation，flexibility,time-savingandlowcost．Atpresent，thetechnologyoffemtosecondlasermicro／nano—machininghasbeenwidelyappliedinphysics，information，material，machineryandbiomedicaltreatmentandotherresearchandindustryfields．However,therea

4、restillmanyimportantproblemsnotyetfullyunderstoodinthistechnology：suchastheunderlyingphysicalmechanisms，therelatedultrafastkineticcharacteristics，aswellashowtoeffectivelycontrolthenano—scaleprocessingbehaviors．Inthisthesis，weusethepump-probetechnologytomainlyinvestigatetheultr

5、afastdynamicsofthefemtosecondlaserinducedperiodicsurfacestructures(LIPSS)orripplesonthebulkcoppermaterial，byirradiatingtwobeamsoffemtosecondlaserpulseswithvariousdelayedtimes．Intheexperiments，wemeasureandanalyzethemorphologycharacteristicsofthesubwavelengthrippleswithdifferent

6、timedelaysbetweenthetwolaserpulses，withaccompanimentofchangingtheenergyfluence，thepolarizationstateoftheincidentfemtosecondlasers．Afterthis，weperformapreliminarytheoreticalanalysisoftheinvolvedphysicalprocesses．Themaincontentsandtheachievedresultsofthisthesisalesummarizedasfol

7、lows：(1)Inthecaseofthetwolaserbeamswiththesamelinearpolarizationdirection，weinvestigatetheeffectofeitherthelaserfluenceorthepulsedelayedtimeontherippleproduction，andfindthatatthelargerdelayedtimetheevidentmeltingtracesIIIAbstractbegintoappearonthemorphologyofripples．(2)Whenthe

8、twolaserbeamshavedifferentanglesbetweentheirlinearlypolarized