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Optics and Spectroscopy

Narrow nonlinear resonances in the polarization spectrum of two-level atoms in a strong polyharmonic quasiresonant light field

S. A. Pulkin, L. F. Vitushkin, Vladimir I. Korotkov, S. V. Lazaryuk

Published Mar 1, 1991• 2 citations
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The numerical solution for polarization for two-level atom in polyharmonic field has been made. The analytical solution for partial case of symmetrical position of carrier frequency relative to transition frequency is possible. The results showed that the nonlinear features in polarization spectrum take place even for small amplitudes of comb-components for small frequency distance between them. It means that it is necessary to take into account nonlinear effects for interpretation of spectra in comb spectroscopy.
A three-level atomic system with a strong three-mode field and a probing biharmonic field at transitions 1→2 and 1⇆3 (1 is a common lower level), respectively, is studied theoretically by numerical simulation and an analysis of the mathematical expressions derived for the particular case of a symmetric arrangement of the strong field components relative to the transition frequency ω 21 . The absorption spectrum of the probing field components contains parametric supernarrow resonances against the background of resonances of the nonlinear interference effect. The ratios of the differences in the frequencies of the strong and probing fields, at which the supernarrow resonances appear, are found analytically. The results coincide with those obtained from numerical simulation.