Abstract
We report the nonlinear optical properties of one metal cluster [PPh 4][C * pWS 3(CuBr) 3(dppm)] by picosecond and nanosecond laser pulses. The third-order nonlinear susceptibility χ (3) is measured by degenerate four-wave mixing, the nonlinear absorption by the Z-scan technique, and optical limiting response by the transmission technique. The experimental data are theoretically fitted, and the mechanism for the third-order optical nonlinearities and the optical limiting properties are discussed, and the absorption cross sections of the ground state and the excited state are evaluated by a rate equation model.
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