Lasers are devices that produce a narrow beam of very strong light. Lasers amplify light by causing photons to be bounced back and forth in a substance (solid, liquid or gas), which adds extra energy. The result is that intense light is emitted in a very narrow beam.
Lasers are used to cut metal and other solid material, and even to burn out skin blemishes such as tattoos in a painless way. In CD players lasers scan a beam of laser light across the CD’s silvery surface, reading the tiny changes in light reflected back. They are also used in office printers and scanners. In engineering, the intense narrow beam of laser light is used to measure and align roads and tunnels.
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