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A simple and by no means comprehensive explaination is;

A L.A.S.E.R (Light Amplification by Stimulated Emission of Radiation) is produced by 'pumping' energy into electromagnetic radiation, often light within a crystal or gas which has a mirror at one end and a semi-permeable mirror at the other. This energy aligns the light rays and gives them all the same frequency. They are then called 'coherent'. They bounce between the mirrors until such an energy lever is acheived whereby the beam breaks out of the semi mirror in a tight powerful beam.

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I believe you are referring to a laser beam.


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