Study on the third-order nonlinear optical properties of Cd2+ ion doped ZnS/PVP nanocomposite films Babu Suresh, Selvam Ramachandran and Govindaraj Shanmugam Eur. Phys. J. Appl. Phys., 97 (2022) 24 Published online: 20 May 2022 DOI: 10.1051/epjap/2021210187