An experimental and theoretical study of the non-linear optical properties of two derivatives of 1-Aryl-3-(4-Methoxyphenyl)-5-(Benzo(d)(1,3)Dioxol-5-yl)-2H-pirazolines was carried out. Pyrazolines based on the excitation power of the laser, to establish its potential use in the photonics industry 1. These compounds already synthesized and characterized by UV-vis spectroscopy, in THF as a solvent, were submitted to readings in the Z-scan system to determine different optical parameters, such as the non-linear refractive index (η2), the absorption coefficient nonlinear (β) and third order electronic susceptibility (X (3)). For these measurements, a Cd Nd: YAG laser emitting at 532 nm, a focus of a 10 cm lens, a 1 mm iris and a cell with a length of 1 mm were used; To support the experimental results, quantum mechanical calculations were performed with the calculation level M06-2X / 6-31 G (2d). This study allowed to correlate the molecular design with the optical properties.