Fluorophosphate glass, glass preform, optical element, and optical instrument having same

Abstract

The invention discloses fluorophosphate glass, a glass preform, an optical element, and an optical instrument having the same. The fluorophosphate glass comprises: cations and anions, the cations comprising: 25-40 mol% of P<5 +>; 8-22 mol% of Al < 3 + >; 3-15 mol% of Sr<2 +>; 1-10 mol% of Y < 3 + >; 1-10 mol% of Gd < 3 + >; 0-8 mol% of La < 3 + >; 25-40 mol% of Ba < 2 + >, wherein n (Gd < 3 + > +La < 3 + >) / n (Y < 3 + > + Ba < 2 + >) is greater than 0.085. The fluorophosphate glass has a refractive index of 1.52-1.60, an Abbe number of not less than 68, excellent optical properties and the like, and low transition temperature so that the service life of a mold is prolonged, and market requirements are met.

Description

technical field [0001] The invention belongs to the technical field of fluorophosphate glass, in particular, the invention relates to fluorophosphate glass, a glass preform, an optical element and an optical instrument having the same. Background technique [0002] Fluorophosphate optical glass is a special optical glass with low dispersion, which can eliminate secondary spectral chromatic aberration, improve the imaging quality of optical lenses, and has a low softening point, and can be made into aspheric lenses by one or two pressings , is an excellent optical material for the production of advanced digital products, so it has a high demand, especially low-dispersion colorless fluorophosphate optical glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. Some optical glass has a high transition temperature, which is easy to cause damage to the mold, thereby reducing the service life of the mold. [0003] Therefore, it is necessary ...

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Problems solved by technology

[0002] Fluorophosphate optical glass is a special optical glass with low dispersion, which can eliminate secondary spectral chromatic aberration, improve the imaging quality of optical lenses, and has a low softening point, and can be made into aspheric lenses by one or two pressings , is an excellent optical material for the production of advanced digital products, so it has a high demand, especially low-dispersion colorless fluorophosphate optical glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. Some optical glass has a high transition temperature, which is easy to cause damage to the mold, thereby reducing the service life of the mold

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