Patent ID: 8592331

Claim:
A fluorophosphate optical glass, comprising: a refractive index of 1.45-1.52, an abbe number of 78-85, a transition temperature lower than 465° C., a density lower than 3.8 g/cm 3 , and a hardness higher than 360 (10 7 Pa), wherein the fluorophosphate optical glass consists essentially of 18-25 mol % of AlF 3 , 5-20 mol % of Al(PO 3 ) 3 , 7-12 mol % of MgF 2 , 15-25 mol % of CaF, 18-25 mol % of SrF 2 , 8-20 mol % of BaF 2 , 0-8 mol % of Ba(PO 3 ) 2 , 0-3 mol % of YF 3 and 0-0.5 mol % of BaCl 2 .