Optical measurements of Nd3+/Yb3+ codoped fluoroindogallate glasses

We report on the optical properties of Nd3+–Yb3+ codoped lead fluoroindogallate melted glasses, with the following molar composition: 30PbF2–20GaF3–15InF3–15ZnF2–(20 − x)CaF2–xNdF3 and 30PbF2–20GaF3–15InF3–15ZnF2–(19 − x)CaF2–xYbF3–1NdF3 (with x=0.1, 0.5, 1, 2, 4, 5). Photoluminescence and time resolved photoluminescence measurements were performed to investigate energy transfer processes among Nd3+ and Yb3+ ions. The time decay of the 4F3/2 Nd3+ level was monitored as a function of Yb concentration. As a result, it was concluded that the CDA parameter characterizing the cross-relaxation among Nd3+ ions is CDA(Nd–Nd)=1.3×10−40 cm6/s and the energy transfer efficiency from Nd3+ to Yb3+ ions is about 85% for the 1 mol% Nd3+:5 mol% Yb3+ sample.