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Oznaka Laser - Spletna trgovina Izdelam ti
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Laser (ime je iz angleškega akronima LASER; Light Amplification by Stimulated Emission of Radiation,) je naprava, ki za vir energije uporablja pojav stimuliranega sevanja (emisije) in ojačanja svetlobnega sevanja. Značilnosti laserske svetlobe so: velika intenziteta, pravilna porazdelitev intenzitete po preseku žarka, majhna divergenca, koherentnost in značilna valovna dolžina.

Za razumevanje delovanja laserja je nujno potrebno poznavanje narave svetlobe.

Novica o prvem poskusu v letu 1960 je sicer navdušila znanstveni svet, vendar je minilo še skoraj 20 let do prvih zanesljivih naprav, ki so uporabile laserski snop za obdelavo.

Zaradi prostorske koherence je laserski snop mogoče koncentrirati oz. fokusirati na izredno majhno površino, to polje imenujemo transverzalni elektromagnetni rod TEM, ki lahko ima različne oblike.

V industrijski proizvodnji je med laserji najbolj razširjen in najpomembnejši ogljikov-dioksidni laser. Njegove izrazite prednosti so v veliki kontinuirani moči, dobri kakovosti žarka ter učinkovitosti. Zaradi tega se uporabljajo za: toplotno obdelavo kovin, varjenje, rezanje, vrtanje, frezanje, označevanje, perforiranje, oblaganje, krivljenje in pretaljevanje. Pri vpadu laserskega snopa na površino obdelovanca se del energije odbije, drugi del pa absorbira v notranjost plasti nekaj µm globoko v osnovni material, ki se zaradi tega stali ali pa celo upari. Pomožni plini ta pretaljen material odstranijo.