Fluorophosphate optical glass

Details Fluorophosphate optical glass Fluorophosphate optical glass

1987-11-03

1989-02-28

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501902, C03C 3247, C03C 400

Patent

active

048085561

ABSTRACT:
A fluorophosphate optical glass with a low refractive index and low dispersion is provided in stable manner, which has a refractive index nd of 1.42 to 1.47 and an Abbe number .nu.d of 90 to 97 and comprises 3 to 8 mole % of P.sub.2 O.sub.5, 0.1 to 2 mole % of Al.sub.2 O.sub.3, 1 to 7 mole % of BaO, 35.5 to 41 mole % of AlF.sub.3, 8 to 13 mole % of MgF.sub.2, 16 to 26 mole % of CaF.sub.2, 15 to 21 mole % of SrF.sub.2, 3.5 to 10 mole % of BaF.sub.2 and 1 to 6 mole % of NaF.

REFERENCES:
patent: 4358543 (1982-11-01), Nozawa
patent: 4363879 (1982-12-01), Broemer et al.
patent: 4427784 (1984-01-01), Nakamura et al.

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