The differences and similarities between spontaneous and stimulated emissions needs to be explained.
The process of spontaneous emission is responsible for the most ordinary light. Depending on the method by which the electrons are basically excited and get emitted the mechanism differs.
Like luminescence is the method when electrons are essentially excited by means other than heating.
Stimulated emission of radiation can be stated as the process where the electrons interact with an electromagnetic-wave in the form of photon. In this process the electron loses its energy and its energy is transferred to the incoming electromagnetic radiation which travels in the form of photon.
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