 Stimulated emission

Stimulated emission is a fundamental process in quantum mechanics and is key to the operation of lasers (Light Amplification by Stimulated Emission of Radiation). It occurs when an excited atom or molecule, which has absorbed energy and is in an excited state, is induced to emit a photon (a particle of light) of a specific wavelength.

Photon hits excited electron, makes that electron go down, and generates a new identical photon in the process, with the exact same:This is the basis of lasers.

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