In practice, completely coherent optical pumping may not occur due to power-broadening of the linewidth of a transition and undesirable effects such as hyperfine structure trapping and radiation trapping. Therefore the orientation of the atom depends more generally on the frequency, intensity, polarization, spectral bandwidth of the laser as well ...
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http://en.wikipedia.org/wiki/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 ... [4 related articles]
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http://www.britannica.com/eb/a-z/o/25
The excitation of the lasing medium by the application of light rather than electrical discharge. See also: Laser.
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https://www.encyclo.co.uk/local/20687
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.
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https://www.infoplease.com/dictionary/optical-pumping
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