Laser stands rau "lub teeb amplification los ntawm stimulated emission ntawm hluav taws xob". Ib cag ntawm kev txiav cov ntawv siv lasers, lawv tau siv rau kev sib koom ua ke, kho cua sov, tshuaj xyuas, thiab kev tsim khoom dawb. Laser txiav txawv ntawm lwm cov txheej txheem laser machining vim nws xav tau lub zog ntau dua tab sis luv dua lub sijhawm sib cuam tshuam.
Lasers yog generated los ntawm ib tug high-siv lub teeb qhov chaw nyob rau hauv lub reflective laser kab noj hniav, uas muaj ib tug laser pas nrig uas generates hluav taws xob. Lub teeb qhov chaw nkoos lub laser pas nrig atoms thaum lawv nqus wavelengths ntawm lub teeb los ntawm lub teeb qhov chaw. Lub teeb yog tsim los ntawm cov pob me me ntawm photons uas tawm tsam cov xov xwm tshaj tawm atoms energizes lawv. Lub photon's energized atoms, muab ob tug ntxiv photons nrog tib lub wavelength, kev taw qhia, thiab theem, hu ua stimulated emission. Cov photons tshiab txhawb nqa lwm lub zog atoms tsim ntau cov photons, ua rau muaj kev zoo siab.
Cov photons txav mus rau qhov sib npaug rau cov iav sib luag nyob rau ntawm qhov kawg ntawm lub laser pas nrig tab sis nyob hauv lub pas nrig laser. Ib daim iav yog transmissive, enabling ib nrab dim ntawm lub teeb los ntawm kab noj hniav. Qhov kev khiav tawm ntawm kev sib koom ua ke, lub teeb monochromatic yog lub teeb laser siv los txiav cov khoom. Lwm txheej iav los yog fiber-optics ncaj qha teeb rau hauv lub lens uas tsom lub teeb rau hauv cov khoom.
Peb hom lasers tseem ceeb siv rau kev txiav, yog CO₂, Nd-YAG (Neodymium Yttrium-Aluminum-Garnet) lasers, thiab fiber-optic lasers. Lawv txawv nyob rau hauv cov ntaub ntawv siv los tsim lub laser beam.