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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term laser originated as an acronym for light amplification by stimulated emission of radiation.
These lasers are called broad-area, or multimode lasers. They cannot be focused to a diffraction-limited spot or efficiently coupled into a single-mode fiber. Note, too, that although the facet may be 30 times wider, the maximum power of a multimode laser is less than 30 times higher than that of a single-mode laser.