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Tb 3+-doped fluorophosphate glasses with the composition of P 2 O 5-K 2 O-SrF 2-Al 2 O 3-x Tb 4 O 7 (where x = 0.1, 0.5, 1.0, 2.0 and 4.0 mol%) were prepared by a conventional high temperature melt quenching technique and characterized through absorption, emission, excitation and decay measurements. From the emission studies, a strong green emission at around 546 was observed, which corresponds to the 5 D 4 → 7 F 5 transition of Tb 3+ ion. Green/blue intensity ratios (I G /I B) were evaluated as a function of Tb 3+ concentration and vice versa. Higher I G /I B intensity ratio confirms the higher covalency between Tb-O bond and higher asymmetry around the Tb 3+ ions in the present fluorophosphate glasses. The decay curves for the 5 D 4 level of Tb 3+ ion were measured and found that they exhibited single exponential nature irrespective to the dopant concentration. The experimental lifetime was determined using single exponential fitting and found that it increased from 2.65 to 2.95 ms when Tb 3+ concentration increased from 0.1 mol% to 4.0 mol%. The derived properties were compared to the other Tb 3+-doped glasses in order to see the potentiality of the material for visible laser gain media at 546 nm.

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