An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.
    

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Microbead 'lasers' engulfed by cells, artistic impression

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Red laser

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Lasermedizin

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Laser cleaning in conservation : an introduction / edited by Martin Cooper.

Medical laser application

How the laser happened : adventures of a scientist / Charles H. Townes.

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Lasers

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Lasermedizin

Microarray analysis

Laser cleaning in conservation : an introduction / edited by Martin Cooper.

Medical laser application

How the laser happened : adventures of a scientist / Charles H. Townes.