Figure 2

Unpolarised optical absorption coefficient of KGd0.996Ce0.004(PO3)4 at room temperature. Propagation direction is along b axis. Labels in purple indicate the absorption transitions of Gd3+ and labels in pink those of Ce3+. Inset: Unpolarised optical absorption cross section of 2F5/2→5d1 transition of Ce3+ in KGd0.996Ce0.004(PO3)4 at room temperature.