Abstract
An optical bleaching effect in a BiI3 microcluster colloidal system in the visible region was observed. We find that this effect can be adequately explained by a two-level model with inhomogeneous broadening. By measuring the intensity dependence of the saturated absorption coefficient, we evaluated the third- and fifth-order effective nonlinear-optical susceptibilities of the BiI3 microcluster colloidal system to be approximately 10−10 and 10−15 esu, respectively. By applying the effective-medium approximation, we find that the third-order nonlinear-optical susceptibility of BiI3 microclusters is approximately 5 × 10−6 esu.
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