LASER stands for "light amplification by stimulated emission of radiation" It is a artificially created light beam for special purpose use. All laser beams are a single color and thought of as emitting light with a narrow wavelength spectrum-"monochromatic" light.
Laser can be generated in different wave lengths - ultra violet, infrared and even visible range and name reveals how they have been generated like solid-state lasers, gas lasers, semiconductor lasers and excimer lasers etc.
Lasik surgery uses ultraviolet beams called "excimer" lasers
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