Time Resolved Fluorescence and Energy Transfer Analysis of Nd3+–Yb3+–Er3+ Triply-Doped Ba–Al-Metaphosphate Glasses for an Eye Safe Emission (1.54 μm) Atul D. SontakkeKaushik BiswasKalyandurg Annapurna Rapid Communication 23 October 2009 Pages: 425 - 434