Abstract

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 1.40×1014esu at a concentration of 3.00×105M. The second hyperpolarizability for the sample solution is deduced to be as large as 2.35×1031esu. The dynamic characteristics of the nonlinear optical response and the origins of the OKE signal can be attributed to excited singlet state populations.

© 2009 Optical Society of America

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