The |n<sub>2</sub>| of poly(aryleneethynylenes), a novel class of conjugated polymers, their derivatives, and model substances was studied by time-resolved degenerate four-wave mixing. The measurements were performed in solutions at 1047 nm with picosecond time resolution and on thin films at 800 nm with femtosecond time resolution. A time response of the nonlinearities faster than the pulse durations used was found. |n<sub>2</sub>| values of as much as 4.9×10<sup>−13</sup> cm<sup>2</sup>/W were measured on thin films of the polymers.
© 2002 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(160.5470) Materials : Polymers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
Mario Hotzel, Sabine Urban, Daniel Ayuk Mbi Egbe, Thomas Pautzsch, and Elisabeth Klemm, "Degenerate four-wave mixing measurements of the third-order nonlinearity of poly(aryleneethynylenes) and their model substances," J. Opt. Soc. Am. B 19, 2645-2649 (2002)