Figure 3.

Absorption coefficients of Dy${}^{3+}$ (0.45 at.%) and Tb${}^{3+}$ (0.90 at.%) single-doped as well as Dy${}^{3+}$/Tb${}^{3+}$ (0.45 at.%/0.89 at.%) double-doped BaB glasses. The glass background is indicated by the dashed line.