Spontaneous Emission

Eventually an excited atom will release the energy that has excited it as a photon, and the electron concerned will drop back to a lower or ground state. This will happen spontaneously after some average time for the material, known as the lifetime.

Spontaneous Emission
 
 

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Related Terms: Amplified Spontaneous Emission, Emission Spectra, Erbium, Erbium Doped Fiber (EDF), Neodymium, Ytterbium