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stimulated emission

(Science: radiobiology) radiation coherently emitted by excited ions when driven by a passing light wave and the appropriate transition wavelength. Laser means Light amplification by Stimulated emission of Radiation, it occurs when there is a population inversion between the upper and lower energy states of the transition, such that stimulated emission can dominate excitation. Stimulated emission is coherent and codirectional with the stimulating wave, and the rate of stimulated emission is proportional to the intensity of the stimulating wave.