Laser thev naus laus zis, tsom mus rau tiam thiab siv cov kab teeb ci sib txuas, sawv cev rau ib qho ntawm kev hloov pauv kev tshawb fawb tshaj plaws ntawm lub xyoo pua 20th. Lo lus "laser" yog ib lub ntsiab lus rau lub teeb Amplification los ntawm Stimulated Emission of Radiation. Cov txheej txheem no ua rau lub teeb nqaim, khaus khaus ntawm lub teeb uas txhua qhov nthwv dej zoo sib xws hauv theem thiab wavelength (monochromatic).
Cov yam ntxwv tshwj xeeb ntawm lub teeb laser-coherence, siab siv, thiab directionality- pab kom cov ntawv thov tsis tuaj yeem nrog lub teeb pom kev zoo. Hauv kev tsim khoom lag luam, lasers ua tiav kev txiav, vuam, thiab micromachining ntawm cov hlau, semiconductors, thiab plastics, tsav tsheb automation thiab tswj kom zoo. Cov chaw kho mob siv cov lasers rau cov txheej txheem phais me me, kho qhov muag kho qhov muag, kho kab mob dermatology, thiab kho hniav, muab qhov cuam tshuam me me thiab rov qab sai dua. Kev sib txuas lus yog nyob ntawm tag nrho ntawm laser diodes kom xa cov ntaub ntawv ntau dhau los ntawm lub ntiaj teb fiber ntau -optic networks. Tsis tas li ntawd, lasers yog qhov tseem ceeb hauv cov khoom siv hluav taws xob (DVD/Blu-ray players, printers), kev tshawb fawb (spectroscopy, particle acceleration), thiab tiv thaiv (rangefinders, guidance systems).
Kev tshawb fawb tsis tu ncua tsom mus rau kev txhim kho ntau zog, ua tau zoo, thiab cov lasers compact, nrog rau ultrafast pulsed lasers thiab quantum cascade lasers. Raws li cov thev naus laus zis hloov zuj zus mus, nws txuas ntxiv qhib qhov muaj peev xwm tshiab hauv kev tsim khoom, cov ntaub ntawv muaj peev xwm, thiab kev kho mob kho mob, ua kom nws lub luag haujlwm ua lub hauv paus ncej ntawm cov cuab yeej siv niaj hnub no.
