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Nonlinear Dynamics in Optical Systems

Nonlinear Dynamical Effects in the Absorption Spectra of Weak Electromagnetic Field and in Four-Wave Mixing

É. G. Pestov, Anatoly N. Oraevsky

Published Jan 1, 1990• 0 citations
Publisher

Abstract

The new nonlinear dynamical effects due to the influence of strong laser field (LF) on relaxation processes in two-level quantum systems are investigated. The dramatic change of the dependence of the probe field absorption spectral line shape and four-wave mixing amplification coefficient of weak field on LF intensity is discussed.
DOI
10.1364/nldos.1990.dmmpcps500

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A nonperturbative theoretical study of four-wave-mixing processes in four-level systems is presented. Using the density-matrix formalism, numerical results are obtained for two arbitrarily intense pump fields with the third field a weak probe. The fourth wave, radiated by the system, is obtained analytically for some special cases. We find, for different frequency detunings, Rabi frequencies, and relaxation rates that the line shapes exhibit: (i) dynamic Stark splitting and shifting, and merging of resonances; (ii) power broadening with two-photon antiresonance behavior resulting from a destructive interference between different contributions to the optical polarization; and (iii) extra resonances induced by field intensities and saturation processes.
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