Study on the third-order nonlinear optical properties of Cd2+ ion doped ZnS/PVP nanocomposite filmsBabu Suresh, Selvam Ramachandran and Govindaraj ShanmugamEur. Phys. J. Appl. Phys., 97 (2022) 24DOI: https://doi.org/10.1051/epjap/2021210187