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1、ApplicationofpicosecondlasersforsurfacemodificationandpolishingKrstePangovski,KunLi,Dr.BillO’NeillCentreforIndustrialPhotonics,InstituteforManufacturing,DepartmentofEngineering,UniversityofCambridge,Cambridge,CB30FSAbstract:Thispaperexaminestheinteractionof100pslaserpulsesinpseudo-contin
2、uouslasingmodeonSS304Stainlesssteel.Theoreticalmodelsforpicosecondinteractionsareexaminedandqualitativeexplanationsofmaterialresponseexperimentsarepresented.Finally,wedemonstratesurfacepolishingofSS304stainlesssteeltargets.1.IntroductionTherehasbeenastartlingaccelerationinthedevelopmento
3、findustrialLasersourcesinrecentyears.Fiberanddisclasershaveledtheway,improvingbeamqualitytothediffractionlimit,whileatthesametimeincreasingtheavailablepower.Currentmarketsizeforindustrialmaterialprocessinglasersstandatover€6Bnperyearwithlasercutting,drilling,microprocessingandmarkingcomp
4、risingthemajorityofthesharewithintheAutomotive,AerospaceandSemiconductorindustries.Asof2010,thisaccountedforsome70%oftheoverallmarketunitssoldworldwide.Realworldapplicationsarepushingthedevelopmentofhighrepetitionrate,highbeamquality,highaveragepowerultrafastfiberlasers.Overthepastdecade
5、availabilityofnanosecondsourceshasstimulatedstudyinthefield.Thenextnaturalchoiceforstudy,namelylownanosecondandpicosecondinteractionregimes,remainslargelyunexplored.Theintroductionofhighperformanceshort-pulsesystemssuchasfiberandDPSSlaserswithrepetitionratesintheseveralhundred-kHzrange,h
6、aveprovidedtheuserwithawiderangeofinteractionparameterstochosefrom.However,understandingthefundamentalmechanismsgoverninglightmatterinteractionneedstobefurtherstudiedtoenableprecisecontrolofmaterialresponsesforprecisionmaterialprocessing.Inthispaperwepresentsurfacemodificationandsurfacep
7、olishingofSS304stainlesssteeltargetsusingpicosecondlasersoperatingathighrepetitionrates7.2MHz,andhighpulseenergies(max2.08µJ).2.TheoryMaterialabsorptionplaysanimportantroleinlasermachining.MaterialabsorptionisacomplexmechanismanddependsonthetemperatureofthesampleT,laserwa
