有机磷富勒烯衍生物光学非线性的溶剂影响研究

Optical nonlinearities and optical limiting of an organophosphorus fullerene derivative in four different solvents were determined by the Z-scan method by use of a nanosecond-pulse laser at 532 nm. Experimental results show that the effect of solvent plays important role in optical nonlinearities of the organophosphorus fullerene derivative. In the solvent of CS2 which has large Kerr effect, the organophosphorus fullerene derivative presents larger reverse saturable absorption and stronger optical limiting than that in other solvents. However, nonlinear refraction of the fullerene derivative in CS2 becomes small. Using a five-level model to fit the experimental data, we obtained some parameters such as excited-state absorption and refraction cross sections.