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Polarization Properties of Optical Phase Conjugation by Two-Photon Resonant Degenerate Four-Wave Mixing.

机译:双光子共振退化四波混频光学相位共轭的偏振特性。

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We develop a semiclassical theory of the polarization properties of phase conjugation by two-photon resonant degenerate four-wave mixing. The theory include the effects of saturation by pump waves. We solve the density-matrix equations of motion in steady state for a nonlinear medium consisting of stationary atoms with a ground and excited state connected by two-photon transitions. As an illustration of the general results, we consider an So to So two-photon transition, which is known to lead to order theory. We show that the fidelity of the polarization-conjugation process is degraded for excessively large pump intensities. The degradation can occur both due to transfer of population to the excited state and due to nonresonant Stark shifts. Theoretical results are compared to those of a recent experiment. Reprints. (RRH)

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