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Now, a team of physicists from the United States, Russia, and Germany have for the first time experimentally demonstrated laser oscillation without population inversion.
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.
If, contrary to statistical expectations, a large number of atoms are brought to the same, high energy state, usually by some kind of resonant pumping, a population inversion exists.

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