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Holmium/Ytterbium co-doped fluorophosphate glasses with compositions (80-x-y) NaPO3-10SrF2-10ZnF2-xHoF3-yYbF3 (x=l and y =0.5, 1, 1.5 and 2 mol%) were prepared by melt-quenching technique.Characteristic temperatures of these glasses were determined by differential thermal analysis.