A glass article includes P, Al, an alkali earth metal, F and O, wherein the content of P and O is greater at the surface side of the glass article than the inner side thereof and the content of the alkali earth metal and F is less at the surface side of the glass article than the inner side thereof.

A glass article includes P, Al, an alkali earth metal, F and O, wherein the content of P and O is greater at the surface side of the glass article than the inner side thereof and the content of the alkali earth metal and F is less at the surface side of the glass article than the inner side thereof.

The present disclosure provides an optical glass including: by cation %, 30% to 45% of a P.sup.5+ component; 10% to 20% of an Al.sup.3+ component; and 20% to 40% of a Ba.sup.2+ component, and, by anion %, 75% to 95% of an O.sup.2− component; and 5% to 25% of an F.sup.− component.

The present disclosure provides an optical glass including: by cation %, 30% to 45% of a P.sup.5+ component; 10% to 20% of an Al.sup.3+ component; and 20% to 40% of a Ba.sup.2+ component, and, by anion %, 75% to 95% of an O.sup.2− component; and 5% to 25% of an F.sup.− component.

An optical glass contains the following components in molar percentage of cations: 2-20% of P.sup.5+, 20-40% of A1.sup.3+, 0.5-10% of Ba.sup.2+, 5-25% of Sr.sup.2+, 15-35% of Ca.sup.2+, and 1-15% of Mg.sup.2+, and contains the following components in molar percentage of anions: 83-95% of F.sup.− and 5-17% of O.sup.2−. The fluorophosphate optical glass has a refractive index (nd) of 1.42-1.45, an Abbe number (vd) of 93-96, a density (ρ) of 3.55 g/cm.sup.3 or less, a bubble degree of grade B or above, a thermal expansion coefficient of 160×10.sup.−7/K or less, a durability of water (D.sub.w) of grade 2 or above, and an excellent crystallization resistance performance.

An optical glass contains the following components in molar percentage of cations: 2-20% of P.sup.5+, 20-40% of A1.sup.3+, 0.5-10% of Ba.sup.2+, 5-25% of Sr.sup.2+, 15-35% of Ca.sup.2+, and 1-15% of Mg.sup.2+, and contains the following components in molar percentage of anions: 83-95% of F.sup.− and 5-17% of O.sup.2−. The fluorophosphate optical glass has a refractive index (nd) of 1.42-1.45, an Abbe number (vd) of 93-96, a density (ρ) of 3.55 g/cm.sup.3 or less, a bubble degree of grade B or above, a thermal expansion coefficient of 160×10.sup.−7/K or less, a durability of water (D.sub.w) of grade 2 or above, and an excellent crystallization resistance performance.

A bioactive borate glass composition including, for example: 30 to 60% B.sub.2O.sub.3; 0.5 to 20% ZrO.sub.2; 3 to 30% Na.sub.2O; 0.1 to 15% K.sub.2O; 0.1 to 15% MgO; 5 to 30% CaO; and 1 to 5% P.sub.2O.sub.5 in mole percents based on 100 mol % of the total composition. Also disclosed is a method of making and method of using the compositions and the bioactive borate glass dentin treatment formulations.

A bioactive borate glass composition including, for example: 30 to 60% B.sub.2O.sub.3; 0.5 to 20% ZrO.sub.2; 3 to 30% Na.sub.2O; 0.1 to 15% K.sub.2O; 0.1 to 15% MgO; 5 to 30% CaO; and 1 to 5% P.sub.2O.sub.5 in mole percents based on 100 mol % of the total composition. Also disclosed is a method of making and method of using the compositions and the bioactive borate glass dentin treatment formulations.

An imaging system includes at least one laser light source having a wavelength in the visible spectral range and a beam guidance element with high solarization resistance at high beam power densities. The invention also relates to the use of the imaging system, in particularly in projectors and in material processing.

A low melting point tin phosphate-based glass frit contains, in mol %, 15-75% of SnO, 0-40% of SnF2, 10-50% of P2O5, 0-30% of ZnO, 0-5% of Al2O3, 0-30% of B2O3, 0-5% of In203, 0-5% of BaO, and 0-5% of SiO2, does not contain Pb, and exhibits a temperature difference of 50° C. or less between the glass transition point to the glass softening point. The glass frit has a low softening point temperature and a conventional glass transition point temperature without using a substance that places a burden on the environment such as lead.