The influence of different remelting conditions on the transparency and optical properties of borate glass incorporated with β-BaB2O4

The fabrication of transparent B2O3-based glasses containing non-linear optical crystals of β-BaB2O4 particles by the incorporation method was studied. Some properties such as refractive index n, second harmonic generation (SHG) efficiency and electric resistance of the remelted glasses were measured. Tg and Tx were decreased by the addition of BBO particles. A small difference in the refractive index between matrix glasses and incorporated crystals is a significant reason for the transparency. The best efficiency for SHG was 10% of the BBO crystal for the sample remelted by mixing the 40BaO–30B2O3–25SiO2–5K2O (GPII) glass and 15 wt.% BBO content at 960°C for 3 min.