Fluorophosphate glass, glass preform, optical element, and optical instrument provided with optical element

Abstract

The invention discloses a fluorophosphate glass, a glass preform, an optical element, and an optical instrument provided with the optical element. The fluorophosphate glass comprises cations and anions, and the cations comprise 25-40 mol% of P<5+>, 8-22 mol% of Al<3+>, 1-30 mol% of Ln<3+> and 25-55 mol% of R<2+>, wherein the Ln<3+> is at least one La<3+>, Gd<3+>, Y<3+> and Yb<3+>, and the R<2+> isat least one of Ba<2+>, Ca<2+>, Sr<2+> and Mg<2+> and the anions comprise 38-50 mol% of F<-> and 50-62 mol% of O<2->, wherein a ratio of n(Ln<3+>)/n(R<2+>) is more than 0.11. The fluorophosphate glass has a refractive index of 1.52-1.60 and an Abbe number of 68 or more, and has excellent optical properties and a low refractive index high temperature coefficient, so the fluorophosphate glass is suitable for the outdoor high temperature environment, and meets the needs of the market.

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 glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. The thermal phase difference caused by the large change of the refractive index of some optical glasses with the temperature during the application process has a great influence on the prec...

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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 glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. The thermal phase difference caused by the large change of the refractive index of some optical glasses with the temperature during the application process has a great influence on the precision and accuracy of the instruments operating in the high temperature environment, especially the outdoor high temperature environment.

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