Patent ID: 8785335

Claim:
A fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising: % by weight min. max. P 2 O 5 25 60 Al 2 O 3 1 13 MgO 1 10 CaO 1 16 BaO 1 26 SrO 0 16 ZnO 0 10 Li 2 O 0 13 Na 2 O 0 10 K 2 O 4 11 CuO 1 7 ΣRO (R = Mg, Ca, Sr, Ba) 15 40 ΣR 2 O (R = Li, Na, K) 3 18 wherein up to 39% by molar quantity of the O 2− ions are replaced with F.