OPTICAL GLASS Russian patent published in 2018 - IPC C03C3/68 

FIELD: optics.

SUBSTANCE: invention relates to the field of optical material science, in particular to colorless optical glasses not containing lead oxides, with a refractive index n_d≥1.73, the Abbe number ν_d≥40 and density of ρ≤4.2 g/cm³. Invention can be used for manufacturing high-resolution optical systems, photo-, cinema-, lenses, laser technology, ophthalmology, as well as optical systems for recording, reading and transmitting information.

EFFECT: low tendency to crystallization, which is achieved by the additional content of Al₂O₃ (up to 12 % by weight) and Ga₂O₃ (up to 10 % by weight) with a high content of La₂O₃ (up to 63 % by weight) and Nb₂O₅ (up to 12 wt%), which that provide high values of the optical constants.

1 cl, 5 ex