Lead- and arsenic-free high-index optical glass, the use thereof and method for producing an optical element

Lead- and arsenic-free optical glass having a refractive index n Bi 55-70 13-21 SiO 0-9 B 0-10 Li 0-5 Na 0-5 K 0-5 Cs 0-6 MgO 0-10 CaO 0-10 SrO 0-10 BaO 0-10 ZnO 0-10 TiO 0-5 La 0-7 0-6 Nb 0-6 Σ alkali metal oxides 0-5 Σ alkaline earth oxides 0-10 Σ La 0-8 common purification 0-2 wherein the weight ratio of Bi