171045.fig.008a
(a)
171045.fig.008b
(b)
Figure 8: Fluorescence decays of Er3+ around 842 nm (corresponding to the 4S3/24I11/2 emission) obtained in SA1.8EY and SA2.18EY glass and in these samples heat treated at 675 and 690°C for 48 h and excited at 550 nm.