optical pumping

noun Physics, Optics.
a method for increasing the number of atoms or molecules occupying higher energy levels by irradiating them with light of the proper frequencies to raise them to those levels.

Origin:
1950–55

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Encyclopedia Britannica
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optical pumping

in physics, the use of light energy to raise the atoms of a system from one energy level to another. A system may consist of atoms having a random orientation of their individual magnetic fields. When optically pumped, the atoms will undergo a realignment of individual magnetic fields with respect to the direction of the light beam; that is, there will be a rearrangement of magnetic energy levels; and, in some cases, the bulk of the atoms will be oriented to generate a magnetic field throughout the system

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
But these materials can only be activated with pulses of light-called optical pumping-which limits applications.
Fluorescence from the optical pumping region as a function of magnetic field.
Dye lasers commonly employ optical pumping although some types have used chemical reaction pumping.
He specializes in development of helium magnetometers and the application of solid state lasers for optical pumping sources.
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