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inversion |
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The result is a population inversion in which there are more particles in the higher-energy state than in the ground state. Javan et al developed the cold helium-neon laser, basing its mechanism on the transfer of excitation from helium to neon atoms by population inversion and continuous optical maser oscillation. To achieve the population inversion, scientists must "pump" the material with energy from an outside source in such a way that it will invest the energy, or part of it, in the level from which the lasing transition takes place. |
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