Population Inversion Definition

noun
The condition of having enough excited or high-energy states distributed throughout a substance to sustain a chain-reaction of stimulated emission. Lasers, for example, require population inversion in order to generate radiation.
American Heritage

(physics) The creation of a system in which more atoms or molecules are in an excited state than in a ground state.

Wiktionary

Other Word Forms of Population Inversion

Noun

Singular:
population inversion
Plural:
population inversions

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