Abstract
We solved in closed form the resonant-modulation problem for the effect of the high-frequency electric field on the absorption spectra of the three-level system. It is shown that an electric field whose frequency is made resonant with the separation between two upper levels should give rise to the two absorption lines of equal intensity disposed symmetrically in pairs about the allowed line. The separation between these two lines is linearly proportional to the intensity of the electric field. The positions and the property of equal intensity of these lines are the same in both the laser absorption spectrum and the ordinary absorption spectrum.
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