Nonlinear absorption in a novel metallophthalocynine compound (C 12 H 25 O) 8 PcPb was investigated by the Z -scan technique with the irradiation of 8 ns laser pulses at the wavelength of 532 nm. The large optical limiting response was observed. The nonlinear absorption cross section was obtained by the simulation with a simplified rate equation model in which excited triplet-triplet state absorption is dominant. The excited-state absorption cross section and its effective ratio to the ground-state absorption cross section are larger than those of C 60 . The attenuation factor for (C 12 H 25 O) 8 PcPb is 2.5 times larger than that of C 60 , which is induced by the heavy atom lead interposition.
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Shi-Liang et al. (2001) studied this question.
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