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Nd 3+ doped fluorophosphate glasses (PANCaFN) with chemical composition of (50-x) P 2 O 5-12Na 2 O-8Al 2 O 3-10CaO-10KF-10CaF 2-xNd 2 O 3 (where x = 0, 0.5, 1.0, 1.5 and 2.0 mol%) have been successfully prepared by melt-quenching method and characterized by several techniques. The optical absorption measurements exhibited signature of Nd 3+ absorption bands in fluorophosphate glasses showed. The spectroscopic analysis have been carried out using Judd-Ofelt parameters and oscillator strength to determine radiative properties such as radiative transition probability (A R), branching ratio (β r), lifetime (τ), emission cross-section (σ e) and quantum efficiency (η). The highest emission intensity was found at 1060 nm for transition 4 F 3/2 → 4 I 13/2 under excitation wavelength of 582 nm for PANCaFN2. The emission cross section, branching ratio and lifetime were evaluated and showed 4.92 × 10 −20 cm 2, 0.7 and 200 μs, respectively. More importantly, the outstanding quantum efficiency of PANCaFN2 could reach to 98.92%. The addition of Nd 3+ ion into fluorophosphate glass could enhance the spectroscopic properties which could play as a potential candidate for solid state applications. Theoretical optical gain evaluation and experimental calculation confirmed that PANCaFN2 had the higher gain than other samples.

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