The emission of photons by excited electrons when photons collide with them, especially in chain reactions within lasers. The emitted photons and the triggering photons are in phase, have the same frequency and polarization, and travel in the same direction.
Stimulated emission. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/stimulated-emission
The emission of electromagnetic radiation in the form of photons of a given frequency, triggered by photons of the same frequency. For example, an excited atom, with an electron in an energy orbit higher than normal, releases a photon of a specific frequency when the electron drops back to a lower energy orbit; if this photon strikes another electron in the same high-energy orbit in another atom, another photon of the same frequency is released. The emitted photons and the triggering photons are always in phase, have the same polarization, and travel in the same direction. Also called induced emission