Fluorophosphate optical glass, optical preform, element and instrument

Abstract

The invention provides fluorophosphate optical glass, an optical preform, an element and an instrument, which belong to the technical field of optical glass. The optical glass comprises the followingcomponents: in terms of the molar percentage of 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+>, and in terms of the molar percentage of anions, 83-95% of F<-> and 5-17% of O<2->. The fluorophosphate optical glass has a refractive index (nd) of 1.42-1.45, an Abbe number (vd) of 93-96, a density (rho) of 3.55 g/cm<3> or less, a bubble degree of B grade or more, a thermal expansion coefficient of 160*10<-7>/K or less, a water resistance stability (Dw) of grade 2 or more, and excellent crystallization resistance.

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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