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.
© 1992 Optical Society of America
Original Manuscript: November 16, 1990
Revised Manuscript: August 6, 1991
Published: February 1, 1992
Do-Kyeong Ko, Bum Ku Rhee, Jai-Hyung Lee, and Joon-Sung Chang, "Optical bleaching effect in a BiI3 microcluster colloid by saturated absorption spectroscopy," J. Opt. Soc. Am. B 9, 203-207 (1992)