Thermo-mechanical and optical properties of calcium aluminosilicate glasses doped with Er3+ and Yb3+

In this work a series of Er 2 O 3 and Yb 2 O 3 doped and Er 2 O 3 -Yb 2 O 3 co-doped low silica calcium aluminosilicate glasses have been melted at 1470°C under vacuum conditions. Measurements of optical absorption coefficient, mass density, refractive index, Vickers micro-hardness, glass transformation temperature (T g ) and crystallization temperature (T x ) have been carried out. The results showed that these glasses dissolved ∼1.5 mol% Er 2 O 3 and ∼1.1 mol% Yb 2 O 3 in their structure without devitrification and also that only small changes (∼10%) have been measured in their thermal. mechanical and optical properties.