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1、激光焊接LasersWeldingGirishP.Kelkar,Ph.D.激光LASER受激輻射式光頻放大器的英文第一個字母的縮寫LightAmplificationbyStimulationofEmittedRadiation參考資料References激光的工業(yè)應(yīng)用-J.F.ReadyIndustrialApplicationsofLasers,J.F.Ready激光焊接，W.W.DuleyLaserWelding,W.W.Duley激光加工，W.M.SteenLaserMaterialsProcessing,W.M.SteenAWS焊接手冊，1-4A
2、WSWeldingHandbooks,1-4激光加工手冊-美國激光協(xié)會出版HandbookofLaserMaterialsProcessingPublishedbytheLaserInstituteofAmerica公開的相關(guān)文獻Publishedliterature請記住…..Remember…..學習需要積極的參與Learningrequiresactiveparticipation不恥下問Feelfreetoaskquestions無所顧及地提出個人不同見解Donothesitatetopresentdifferentviewpoints光Light
3、光是一種電磁輻射Lightiselectro-magneticradiation我們聽不到.Wavesthatyoucannothear可見光的波長在0.4-0.7微米之間。Visiblefrom0.4-0.7micronwavelength波長小于0.4微米是紫外線和X光Below0.4–ultraviolettox-rays波長大于700nm的光為紅外線和微波。Above0.7–infra-redtomicrowaves0.40.7μmμmVisibleGammax-rayUVIRMicrowaveTVRadio0.01μm0.001μmYAG1μm光
4、的吸收和顏色AbsorptionandColor物體的顏色來源于它反射的光的波長Colorofanobject(wavelengththatitreflects)顏色和光的波長是相關(guān)聯(lián)的。Colorisassociatedwithparticularwavelength黑色和白色代表著什么？Whatisthemeaningofblackorwhitecolor?黑色表面吸收了YAG光，而白色在反射了大部分光。BlacksurfacewillabsorbYAGlightwhilewhitewillreflectmostofit我們?yōu)槭裁葱枰す?？Whydow
5、eneedLasers?材料加工需要吸收很強的光。Absorptionformaterialsprocessingrequiresveryintenselight高強度的光可以通過激光聚焦成光束獲得。Intensitycanbegeneratedbyfocusingabeamoflaserlight普通光不能聚焦成很高的能量密度（或足夠小的點）Ordinarylightdoesnotfocusdowntoahighenoughpowerdensity(orsmallenoughspotsize)手持放大鏡可以把太陽光聚焦讓紙燃燒但是不能把金屬融化Hand-
6、heldlenscanfocussunlighttosetfiretopaperbutnotenoughtomeltmetalLightandLasers單頻的（單波長）Monochromatic(singlewavelength)校準的（平行光）Collimated(parallel)激光LaserLight普通光OrdinaryLight很多波長Manywavelengths不平行NotparallelLightandLasers激光LaserLight普通光OrdinaryLight激光的聚焦FocusingofLasers激光LaserLight普
7、通光OrdinaryLight單頻（單波長）和校準（平行）的光可以聚焦成很小的焦點Monochromatic(singlewavelength)andCollimated(parallel)lightcanbefocusedtoaverysmallspot激光的種類TypesofLasers激光能量傳輸LaserPowerDelivery連續(xù)波ContinuousWave(CW)脈沖PulsedQ-開關(guān)Q-switched激光頻率LaserFrequencies基頻和倍頻Fundamentalandmultiples連續(xù)光纖激光ContinuousWave
8、FiberLasers激光在光纖中產(chǎn)生Laserlightiscr
