The focusing power of this weak nonlinear lens depends on the nonlinear refractive index .
It would be possible to extract its value by analyzing the z - dependent data acquired by the detector and by cautiously interpreting them using an appropriate theory .
Since the focusing power of this weak nonlinear lens depends on the nonlinear refractive index , it would be possible to extract its value by analyzing the z - dependent data acquired by the detector and by cautiously interpreting them using an appropriate theory .