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optical pumping

noun, Physics, Optics.
1.
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
1950-1955
1950-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for optical-pumping

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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