Spontaneous parametric down-conversion

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Science and technology

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What Wikipedia says

Spontaneous parametric down-conversion (also known as SPDC, parametric fluorescence or parametric scattering) is a nonlinear instant optical process that converts one photon of higher energy (namely, a pump photon) into a pair of photons (namely, signal and idler photons) of lower energy, in accordance with the laws of energy conservation and momentum conservation.

Excerpt from the Wikipedia article “Spontaneous parametric down-conversion”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: J S Lundeen at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.