Abstract
This paper analyzes a four-level system interacting with four strong fields with frequencies combining into a cycle. The conditions for coherent population trapping, when a nonabsorbing superposition of states forms, are calculated. It is found that, in contrast to a three-level system, the nonabsorbing state splits, i.e., is realized at two values of the detuning. Such splitting manifests itself as narrow dips in the frequency dependence of the upper-level population. Similar dips are found in the spectrum of the nonlinear susceptibility, which is responsible for the conversion efficiency in the process of four-wave mixing.
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Zh. Éksp. Teor. Fiz. 115, 1961–1972 (June 1999)
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Shapiro, D.A. Field splitting of a nonabsorbing state. J. Exp. Theor. Phys. 88, 1072–1078 (1999). https://doi.org/10.1134/1.558894
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DOI: https://doi.org/10.1134/1.558894