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Laser light is radiation produced by a laser, in which stimulated emission and feedback select and amplify optical modes. It can have high directional concentration, a narrow spectrum and strong coherence compared with ordinary thermal sources.

These are properties to quantify, rather than guarantees of perfect monochromaticity or one universal intensity distribution. A pulsed laser has finite bandwidth, and a multimode laser can have several frequencies. The emission's temporal coherence, spatial mode and polarization determine which interference or focusing experiments it supports.