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We determine the two-photon absorption (2PA) cross section spectra branched polyfluorenes distinguished by the number of fluorenes and chemical architecture. Moreover, the optical properties were determined in function of the effective electrons number of each compound.

We determine the incoherent molecular second-order scattering dispersion β(λ) applying the semi-classical time-dependent perturbation theory on experimentally observable electronic transition whose properties were measured with one- and two-photon absorption techniques. The β dispersion obtained showed to be accurate with well-established direct theoretical and experimental measurements.

Incoherent second-harmonic generation is quantified by the first-order molecular hyperpolarizability, which could be estimated through a fast and reliable method using homemade software to post-process the output files from the Gaussian software package.