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Sodium phosphoniobate glasses with the composition (mol%) 75NaPO 3 –25Nb 2 O 5 and containing 2mol% Yb 3+ and x mol% Er 3+ (0.01⩽x⩽2) were prepared using the conventional melting/casting process. Er 3+ emission at 1.5μm and infrared-to-visible upconversion emission, upon excitation at 976nm, are evaluated as a function of the Er 3+ concentration...
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