This relates to flurophosphate glasses having relatively high refractive indices and small dispersions melted from a mix consisting essentially (mol%) of 70 to 85 fluorides of alkaline earth metals selected from Mg, Ca, Sr and Ba, 10-25 of metaphosphate of metals selected from Mg, Ca, Sr and Ba and Al, and up to 10 of at least one of the compounds KAsO3, K2TaF7 and K2TiF6.
Origin
Ernst Leitz G.M.B.H
Journal Title
B.P. 1136658 11.12.86
Sector
Primary Papers
Class
PP 964