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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光是一種電磁輻射Lightiselectro-magneti
2、cradiation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光的吸收和顏色AbsorptionandColor物體的顏色來源于它反射的光的波長
3、Colorofanobject(wavelengththatitreflects)顏色和光的波長是相關聯(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?？WhydoweneedLasers?材料加工需要吸收很強的光。Absorptionformaterialspro
4、cessingrequiresveryintenselight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-heldlenscanfocussunlighttosetfiretopaperbutnotenoughtomeltme
5、talLightandLasers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(singlewavelengt
6、h)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Q-switched激光頻率LaserFrequencies基頻和倍頻Fundamentalandmultiples連續(xù)光纖激光ContinuousWaveFiberLasers激光在光纖中產生Laserlightiscreatedinthefiber可在連續(xù)波和脈沖波中使用Canbeusedinpulsedmod
7、easwellasCW可以被用于焊接和切割Canbeusedforweldingandcutting激光二極管光LaserDiodeLight激光二極管光LaserDiodeLight光纖Fiber脈沖YAG激光（焊接）PulsedYAGLasers(Welding)閃光燈開關產生脈沖Flashlampturnsonandofftocreatepulses光纖用于傳送激光Fiberisusedtotransmitlaserlight閃光燈（光泵）FlashLamp(OpticalPump)全反鏡100%
