FDTD Modeling of double ultrashort pulse propagation in nonlinear absorbing media J.D. Pisonero, O. Varela, E. García, I. Hernández, J. Ajates, J.L. Sagredo, M. Olivar, C. Albarran, L. Roso and C. Méndez EPJ Web Conf., 238 (2020) 12006 Published online: 20 August 2020 DOI: 10.1051/epjconf/202023812006