2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188175In this paper the two-photon interactions at high energies are investigated considering different approaches for the QCD dynamics. In particular, we calculate the $γ^* γ^*$ total cross section in different theoretical approches and present a comparison among the predictions of the BFKL dynamics at leading and next-to-leading order with those from saturation physics. We analyze the possibility that the future linear colliders could discriminate between these different approaches.14 pages, 2 figures. Version to be published in Journal of Physics G: Nuclear and Particle PhysicsHigh Energy Physics - Phenomenologytext