科研之友
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摘要
The ultrafast third-order nonlinear optical properties of ZnPc(OBu)(6)(NCS)/dimethyl sulfoxide solution are investigated by optical Kerr effect (OKE) and pump-probe techniques with femtosecond pulses. Using CS2 as the reference, the third-order susceptibility of the sample solution is obtained as about 1.40 X 10(-14) esu at a concentration of 3.00 X 10(-5) M. The second hyperpolarizability for the sample solution is deduced to be as large as 2.35 X 10(-31) esu. The dynamic characteristics of the nonlinear optical response and the origins of the OKE signal can be attributed to excited singlet state populations.
