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Radiation emitted when the internal energy of a quantum mechanical system drops from an excited level to a lower level without regard to the simultaneous presence of similar radiation. Note: Examples of spontaneous emission include radiation from an LED, and radiation from an injection laser below the lasing threshold.
- Browse Related Terms: active laser medium, facet erosion, optical disk, Raman scattering, spontaneous emission, Stimulated Emission, superluminescent LED, superradiance, threshold current