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Pronunciation: (lā'zur), [key]
n. Physics.
a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. Also called optical maser.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

laselaser beam
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