Optical glass with high refractive index and low dispersion, and preparation method thereof

Abstract

The invention discloses optical glass with high refractive index and low dispersion. The optical glass comprises SiO2 and B2O3 with a total amount of 5-32%; La2O3, Gd2O3 and Y2O3 with a total amount of 45-65%; at least one of TiO2 and Nb2O5 with a total amount of 1-20%; at least one of Li2O, Na2O and K2O with a total amount of 0-10%; at least one of MgO, CaO, SrO and BaO with a total amount of 0-10 %; 0-15% of ZrO2; 1.5-3.5% of Yb2O3; 0-5% of GeO2; 0-10% of Bi2O3; 1-8% of ZnO; and 0.5-3.0% of Al2O3. The invention also discloses a preparation method. The beneficial effects of the optical glass are that the optical glass comprises no Ta2O5 that is expensive, thereby reducing production cost; and the optical glass comprises no WO3 that can increase optical glass coloring, thereby reducing glass coloring.

Description

technical field [0001] The invention relates to a high-refractive-index low-dispersion optical glass and a preparation method thereof. Background technique [0002] Combining a lens formed of high refractive index low dispersion glass with a lens formed of high refractive index high dispersion glass enables correction of chromatic aberration and miniaturization of the optical system. Therefore, it occupies a very important position as an optical element constituting a projection optical system such as an imaging optical system or a projector. With the rapid development of precision optical instruments, optical information communication, and optoelectronic products, the demand for optical glass with excellent performance is increasing. In optical design and optical communication, optical glass with a refractive index between 1.9 and 2.1 is of great significance to simplify the optical system and improve the imaging quality. The development of ultra-high refractive index opt...

AI Technical Summary

Problems solved by technology

At present, in order to obtain ideal optical constants and achieve a refractive index above 1.90 in existing optical glasses, a large amount of Ta is introduced into the glass components. 2 o 5 and a small amount of WO 3 , but Ta 2 o 5 Expensive, glass cost is too high

At the same time a large number of Ta 2 o 5 The introduction of optical glass will also lead to problems such as poor stability of optical glass, WO 3 Will increase optical glass tinting

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