Femtosecond-laser induced two-photon absorption of GaN and AlxGa1-xN thin films: tuning the nonlinear optical response by alloying and doping - Vivas, M. G.; Manoel, Diego da Silva; Dipold, Jessica; Martins, Renato Juliano; Fonseca, R. D.; Manglano-Clavero, Irene; Margenfeld, Christoph; Waag, A.; Voss, Tobias; Mendonça, Cleber Renato (Journal of Alloys and Compounds, 2020)