Fluorophosphate optical glass, optical prefabricated component, optical element and optical apparatus

Abstract

The invention provides fluorophosphate optical glass, an optical prefabricated component, an optical element and an optical apparatus, and belongs to the technical field of optical glass. The opticalglass contains the following components in percentage by mol based on cations: 2-20% of P<5+>, 20-40% of Al<3+>, 0.5-10% of Ba<2+>, 5-25% of Sr<2+>, 15-35% of Ca<2+> and 1-15% of Mg<2+>, wherein Ba<2+> / Ca<2+> is 0.01-0.155; anions contain the following components in percentage by mol based on anions: F<-> and O<2->, wherein O<2-> / F<-> is 0.105-0.2. According to the fluorophosphate optical glass, the optical prefabricated component, the optical element and the optical apparatus disclosed by the invention, the Ba<2+> / Ca<2+> content proportion is adjusted, so that the density of the optical glassis reduced, and the bubble degree grade and the crystallization resistance performance of the optical glass are improved; the O<2-> / F<-> content proportion is adjusted, so that the thermal expansioncoefficient of the optical glass is reduced, the optical glass is unlikely to be damaged in the die pressing course and the hot processing course, and the glass formation stability is improved. The refractive index (nd) of the fluorophosphate optical glass is 1.42-1.45, the Abbe number (vd) is 93-96, the density (rho) is 3.55 g / cm<3> or below, the bubble degree is B level or above, the thermal expansion coefficient is 160*10<-7> / K or below, the water resistant effect stability (Dw) is 2 type or above, and the crystallization resistance performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of optical glass, in particular to a fluorophosphate optical glass, an optical prefabricated part, a component and an instrument. Background technique [0002] Fluorophosphate optical glass is a new type of glass material with low refractive index and low dispersion. In the optical system, it can eliminate the special dispersion of the secondary spectrum, improve the resolution, improve the imaging quality of the optical system, and has low softening characteristics. , can be directly precision molded into an aspheric lens, which can better eliminate chromatic aberration, spherical aberration, aberration, and reduce system volume and weight. [0003] At present, fluorophosphate optical glass has been widely used in high-precision and high-resolution optical instrument combination lenses such as digital cameras, high-definition monitors, and astronomical telescopes, and has become a new type of optoelectronic...

AI Technical Summary

Problems solved by technology

Specific applications in these fields have put forward higher requirements on the performance of fluorophosphate optical glass. In the existing published literature, there have been reports on fluorophosphate optical glass with an Abbe number of 80 or greater, but these fluorophosphate optical glasses Salt optical glass has high density, poor chemical stability and devitrification resistance, high coefficient of thermal expansion, low bubble degree, and easy to cause damage during molding and heating

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