We present a theoretical model of optical beam propagation in a nonlinear medium for determining the nonlinear refraction and nonlinear absorption accurately and simultaneously by a single <i>Z</i>-scan method. The model is based on the Gaussian decomposition method and symmetric analysis. In principle, accurate nonlinear refraction and nonlinear absorption can be obtained simultaneously by exact experimental data, no matter how much they are. The treatment procedure of <i>Z</i>-scan experimental data is demonstrated.
© 2004 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.3270) Nonlinear optics : Kerr effect
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5940) Nonlinear optics : Self-action effects
Wei-Ping Zang, Jian-Guo Tian, Zhi-Bo Liu, Wen-Yuan Zhou, Feng Song, Chun-Ping Zhang, and Jing-Jun Xu, "Accurate determination of nonlinear refraction and nonlinear absorption by a single Z-scan method," J. Opt. Soc. Am. B 21, 349-356 (2004)