Fluorophosphate optical glass, and optical preform, element and instrument
AssigneeCdgm Glass Co., Ltd
InventorWei Sun
Life of this patent
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Abstract
An optical glass contains the following components in molar percentage of cations: 2-20% of P5+, 20-40% of Al3+, 0.5-10% of Ba2+, 5-25% of Sr2+, 15-35% of Ca2+, and 1-15% of Mg2+, and contains the following components in molar percentage of anions: 83-95% of F− and 5-17% of O2−. 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/cm3 or less, a bubble degree of grade B or above, a thermal expansion coefficient of 160×10−7/K or less, a durability of water (Dw) of grade 2 or above, and an excellent crystallization resistance performance.
Claims21
A fluorophosphate optical glass, comprising:
- in molar percentage of cations, 2-20% of P5+, 20-40% of Al3+, 0.5-10% of Ba2+, 15-35% of Ca2+, and 1-15% of Mg2+, and an anion contains F− and O2−;
- wherein Ba2+/(Ca2++Mg2+) is 0.09-0.125, and
- wherein the fluorophosphate optical glass has a thermal expansion coefficient (α20° C.-120° C.) of the optical glass is 160×10−7/K or less, a density (ρ) of 3.55 g/cm3 or less, and a durability in water (Dw) of grade 2 or above.
A fluorophosphate optical glass, comprising:
- in molar percentage of cations, 2-20% of P5+, 20-40% of Al3+, 0.5-10% of Ba2+, 5-25% of Sr2+, 15-35% of Ca2+, and 1-15% of Mg2+;
- and in molar percentage of anions, 83-95% of F— and 5-17% of O2−, wherein Ba2+/(Ca2++Mg2+) is 0.09-0.125.
A fluorophosphate optical glass consisting of the following components in molar percentage of cations:
- 2-20% of P5+, 20-40% of Al3+, 0.5-10% of Ba2+, 5-25% of Sr2+, 15-35% of Ca2+, 1-15% of Mg2+, 0-10% of Na+, 0-10% of Li+, 0-10% of K+, and 0-6% of Ln3+, wherein Ln3+ is selected from La3+, Gd3+, Y3+ and Yb3+;
- and the following components in molar percentage of anions:
- 83-95% of F− and 5-17% of O2−, wherein Ba2+/(Ca2++Mg2+) is 0.09-0.125.
Dependencies are inferred from the claim text.