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Special crown. Glass grade OK4
Non-silicate optical colorless inorganic glass. In its composition, the special crown is a pure fluoro-
phosphate glass. The main components are fluorides of elements I, II, and III of the periodic table and
metaphosphates.
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Shvabe Description
A special crown is a new type of glass with a higher relative partial dispersion in the blue part of the
spectrum compared to conventional crowns. It is the best material for creating apochromatic optical
systems for correcting the secondary spectrum in the visible region, due to the extremely high value of
the relative partial dispersion.
Parameters of the main properties of colorless optical glass of OK4 brand:
1.Refractive index (λ = 546.07 nm) PE = 1.448500;
2.Dispersion coefficient ve = 91.53;
3 Internal transmission coefficient (λ = 360nm) τi (S = 10 mm) = 0.985
spectrum compared to conventional crowns. It is the best material for creating apochromatic optical
systems for correcting the secondary spectrum in the visible region, due to the extremely high value of
the relative partial dispersion.
Parameters of the main properties of colorless optical glass of OK4 brand:
1.Refractive index (λ = 546.07 nm) PE = 1.448500;
2.Dispersion coefficient ve = 91.53;
3 Internal transmission coefficient (λ = 360nm) τi (S = 10 mm) = 0.985