Polarizing glass having high extinction ratio

A polarizing glass comprising geometrically anisotropic metallic silver particles dispersed and oriented at least in a surface layer thereof,

• wherein the polarizing glass does not contain TiO2 exceeding 1.7 wt %, but contains not less than 0.4 wt % Ag, and
• wherein, at 633 nm, the loss is not more than 0.6 dB, and the extinction ratio is not less than 35 dB, and
• wherein Ag and halogens contained in the polarizing glass satisfy the following relations:
• the molar ratio of Ag/(Cl+Br) is 0.2 to 1.0,
• the molar ratio of Cl/(Cl+Br+F) is 0.5 to 0.95, and
• the molar ratio of Br/(Cl+Br+F) is 0.05 to 0.4.

A polarizing glass comprising geometrically anisotropic metallic silver particles dispersed and oriented at least in a surface layer thereof,

• wherein the polarizing glass does not contain TiO2 exceeding 1.7 wt %, but contains not less than 0.4 wt % Ag, and
• wherein, at 532 nm, the loss is not more than 2.5 dB, and the extinction ratio is not less than 30 dB, and
• wherein Ag and halogens contained in the polarizing glass satisfy the following relations:
• the molar ratio of Ag/(Cl+Br) is 0.2 to 1.0,
• the molar ratio of Cl/(Cl+Br+F) is 0.5 to 0.95, and
• the molar ratio of Br/(Cl+Br+F) is 0.05 to 0.4.