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Proceedings Paper

Investigation of third-order nonlinearity of substituted-polybenzonitriles by heterodyned femtosecond optical Kerr gate
Author(s): YingHua Zou; Li Lin; Wei Qian; Congfang Wang; Qingji Wang; Huiying Chen
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Paper Abstract

The femtosecond optical heterodyne detected otpical Kerr effect is described. The real and the imaginary parts of complex third-order optical nonlinearity can be effectively speared and their values and signs can be determined. Using this method, we have thoroughly investigated the substitution effect by adding side-groups on the -(-C equals N- )-conjugated system, a new class of nonlinear optical material, and find that the polybenzonitrile is an order of magnitude superior to poly-amino-nitrile. But when we further add substituents on benzoid rings, the enhancement is limited. We can say that for the series of polybenzonitrile, the benzoid ring can improve the (chi) (3) value more effectively than other substitutions. We also find the value of second-order hyperpolarizability depends on the polymerization degree, and have discussed the saturation effect when the polymerization increases.

Paper Details

Date Published: 11 October 1999
PDF: 12 pages
Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368267
Show Author Affiliations
YingHua Zou, Peking Univ. (China)
Li Lin, Peking Univ. (China)
Wei Qian, Peking Univ. (China)
Congfang Wang, Peking Univ. (Canada)
Qingji Wang, Peking Univ. (China)
Huiying Chen, Peking Univ. (China)


Published in SPIE Proceedings Vol. 3796:
Organic Nonlinear Optical Materials
Manfred Eich; Manfred Eich; Mark G. Kuzyk, Editor(s)

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