We performed Z-scan measurements to investigate the optical nonlinearity of poly(3-hexadecylthiophene) in a chloroform solution. Values for the real and the imaginary parts of the nonlinear susceptibility were obtained for solutions with various polymer concentrations. The nonlinear-optical properties were studied as a function of polymer concentration and light intensity from which saturation of nonlinear refraction and saturated absorption were observed. The saturation intensity was determined, and the corresponding values are presented for all concentrations studied. Time-resolved measurements of the nondiagonal part of nonlinear susceptibility are also presented.
© 1997 Optical Society of America
Luciene Demenicis, A. S. L. Gomes, D. V. Petrov, Cid B. de Araújo, Celso P. de Melo, Clécio G. dos Santos, and Rosa Souto-Maior, "Saturation effects in the nonlinear-optical susceptibility of poly(3-hexadecylthiophene)," J. Opt. Soc. Am. B 14, 609-614 (1997)