Drastic effects of damping mechanisms on the third-order optical nonlinearity
نویسندگان
چکیده
We have investigated the optical response of superradiant atoms, which undergoes three different damping mechanisms: radiative dissipation (γr), dephasing (γd), and nonradiative dissipation (γn). Whereas the roles of γd and γn are equivalent in the linear susceptibility χ , the third-order nonlinear susceptibility χ drastically depends on the ratio of γd and γn: When γd ≪ γn, χ (3) is essentially that of a single atom. Contrarily, in the opposite case of γd ≫ γn, χ (3) suffers the size-enhancement effect and becomes proportional to the system size.
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