Considering that the nonlinear photoinduced phase shift to a Gaussian beam in a thin
sample of nonlocal nonlinear media can be modeled as a Gaussian function to some real
power the far-field can be calculated using the Fraunhofer integral. In this paper we
calculate numerically this integral to obtain the on-axis intensity in a Z-scan experiment or
the intensity pattern in a self-phase modulation experiment. Experimental results of samples
under cw illumination are fitted using the model with a good correspondence between …

[en] Considering that the nonlinear photoinduced phase shift to a Gaussian beam in a thin
sample of nonlocal nonlinear media can be modeled as a Gaussian function to some real
power the far-field can be calculated using the Fraunhofer integral. In this paper we
calculate numerically this integral to obtain the on-axis intensity in a Z-scan experiment or
the intensity pattern in a self-phase modulation experiment. Experimental results of samples
under cw illumination are fitted using the model with a good correspondence between …