Patent ID: 7608551

Claim:
A bismuth fluorophosphate glass formed from a composition comprising on a mol basis: a metaphosphate Al(PO 3 ) 3 , from 5 to 10 percent; a metaphosphate Ba(PO 3 ) 2 , from 8 to 13 percent; a metaphosphate Bi(PO 3 ) 3 , from 8 to 13 percent; fluorides BaF 2 +RFx, from 64 to 79 percent; and a rare earth dopant M 2 O 3 or MF 3 over 100 wt %; where R is selected from the group consisting of Ca, Mg, Pb, and Bi; x is an index representing an amount of fluoride (F) in the compound RFx; and M is selected from the group consisting of Lanthanide series.