In the theory of production of LASER
pumping means.
(a) Pumping of air
(b) Pumping of water
(c) Pumping of proton
(d) Pumping of electron.
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Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. ... In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier.
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option D is correct
pumping of electron
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