Bismutoxidhaltiges glass, methods of making and using such a glass

Bismutoxidhaltiges glass, comprising the following components (in mol% on oxide): B ≥ 1 B ≥ 1 but <5 Bi 10-60 10-60 rare earth 0-15 M 0-30 M''O 0-20 La 0-15 Ga 0-40 Gd 0-10 Al 0-20 CeO 0-10 ZnO 0-30, wherein M 'is at least one of Li, Na, K, Rb and / or Cs and M' 'is at least one of Be, Mg, Ca, Sr and / or Ba.