noun, Physics.
a condition of matter in which more electrons are in a high energy state than in a lower energy state, as is required for the operation of a laser.
population inversion
The condition of having enough excited or high-energy states distributed in a material that a chain-reaction of stimulated emission can occur. Lasers, for example, need a constant power source that maintains population inversion in order to generate radiation continuously, since each stimulated emission reduces the population of high-energy states. See also stimulated emission.


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    [sah-loo s paw-poo-lee soo-prey-mah leks es-toh; English sey-luh s pop-yuh-lahy-soo-pree-muh leks es-toh] /ˈsɑ lʊs ˈpɔ pʊˌli suˈpreɪ mɑ lɛks ˈɛs toʊ; English ˈseɪ ləs ˈpɒp yəˌlaɪ sʊˈpri mə lɛks ˈɛs toʊ/ Latin. 1. let the welfare of the people be the supreme law: a motto of Missouri. [wohks poh-poo-lee wohks de-ee; English voks pop-yuh-lahy voks […]

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