The word laser is an acronym. Its stands for Light Amplification by Stimulated Emission of Radiation. The first working laser was built in 1960.
Lasers require an active medium and an outside energy source to stimulate the active medium. Unlike ordinary light from an incandescent bulb, lasers emit light that is monochromatic (one color), directional, and usually of a single wavelength.
Laser light is generated when certain atoms are...
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