Patent ID: 6852657

Claim:
Optical colored glass characterized by a composition (in % in weight) of SiO 2 50-62 K 2 O 10-25 Na 2 O 0-14 Al 2 O 3 0-2 B 2 O 3 3-5 ZnO 13.5-37 F 0-1 TiO 2 0-7 In 2 O 3 0-2 Ga 2 O 3 0-2 SO 3 0-1 SeO 2 0-1 C 0-1 M I M III Y II 2 0.1-3 whereby M I =Cu + and/or Ag + M III =In 3+ and/or Ga 3+ and/or Al 3+ , Y II ═S 2− and/or Se 2− with at least 0.1% in weight of the oxide (M 2 O 3 ) of the M III which is/are present in M I M III Y II 2 , and with at least 0.2% in weight of the oxide, of Y II , which is/are present in M I M III Y II 2 , as well as usual refining media if necessary in usual quantities.