Effect of the doping level on the 2.8-µm laser performance of Er3+:CaF2 crystals Venkatesan Jambunathan, Pavel Loiko, Simone Normani, Liza Basyrova, Abdelmjid Benayad, Alain Braud, Ammar Hideur and Patrice Camy EPJ Web Conf., 307 (2024) 04042 Published online: 18 October 2024 DOI: 10.1051/epjconf/202430704042