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The numerical solution for polarization for two-level atom in polyharmonicfield has been made. The analytical solution for partial case of symmetricalposition of carrier frequency relative to transition frequency is possible. Theresults showed that the nonlinear features in polarization spectrum take placeeven for small amplitudes of comb-components for small frequency distancebetween them. It means that it is necessary to take into account nonlineareffects for interpretation of spectra in comb spectroscopy.

The polarization of two-level atom in the polychromatic weak field