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We study the enhanced Kerr-nonlinear coefficient in a three-level L-type atomic system for various couplingbeam powers. The Kerr-nonlinear coefficient behaves very differently in the strong and the weak coupling power regions and changes sign when the coupling or probe frequency detuning changes sign. Comparisons of Kerr-nonlinear coefficients as functions of probe frequency detuning, coupling power, and coupling frequency detuning are presented.doi:10.1364/ol.27.000258 pmid:18007772 fatcat:mgaz6peac5apldpjjsy776k6vy