Laser

A laser is a device that produces a narrow, powerful beam of light in which the waves are all of the same colour and move together.

How it works

The word laser stands for "light amplification by stimulated emission of radiation". The result is a concentrated beam that can travel long distances without spreading much.

Uses

Lasers are used in barcode scanners, DVD and Blu-ray players, fibre-optic communication, surgery, cutting metal and light shows.

Frequently asked questions

What is a laser?

A device that produces a concentrated beam of single-colour light.

Where are lasers used?

In scanners, medicine, communication and manufacturing.