11 October 1999 Investigation of third-order nonlinearity of substituted-polybenzonitriles by heterodyned femtosecond optical Kerr gate
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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.
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YingHua Zou, YingHua Zou, Li Lin, Li Lin, Wei Qian, Wei Qian, Congfang Wang, Congfang Wang, Qingji Wang, Qingji Wang, Huiying Chen, Huiying Chen, } "Investigation of third-order nonlinearity of substituted-polybenzonitriles by heterodyned femtosecond optical Kerr gate", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368267; https://doi.org/10.1117/12.368267
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