A laser is a device that emits a beam of coherent light through an optical amplification process. There are many types of lasers including gas lasers, fiber lasers, solid-state lasers, dye lasers, diode lasers, and excimer lasers. All of these laser types share a basic set of components. Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. … In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier.

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