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Light
A laser is a device that emits a narrow, intense beam of light through the process of stimulated emission. It produces coherent and monochromatic light.
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Stimulated Emission: The process in which an incoming photon triggers the release of additional photons with the same energy and direction.
Coherent Light: Light waves that have consistent phase relationships, meaning they are all in sync with each other.
Monochromatic Light: Light consisting of only one wavelength or color.