WHAT ARE LASERS?
LASER stands for Light Amplification by Stimulated Emission of Radiation.
A laser is a concentrated beam of light, created when an electric current passes through a special material.
The name and color of the laser depend on the type of special material that is used: Argon gas brings a blue-green light; Krypton gas brings red or yellow and YAG (yttrium-aluminum-garnet) yields invisible infrared light
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