| 摘要 |
PURPOSE:To provide the stable title glass capable of transmitting light from visible area to wide infrared ray area and having excellent infrared ray transmission by constituting a glass of ZrF4, BaCl2, LiF and NaF having a specific molar ratio. CONSTITUTION:The aimed infrared ray transmitting glass has a composition consisting of 35-65mol% ZrF4, 5-30mol% BaCl2, 5-30mol% LiF, 5-30mol% NaF and 10-60mol% total amount of LiF and NaF. Ionization tendency can be lessen by furthermore adding at least one kind selected from AlF3, GaF3, YF3, LaF3 and GdF3 to the above-mentioned composition at an amount of 1-15%. Stability can be further improved by moreover adding at least one kind selected from CaF2, SrF2 and BaF2 thereto at an amount of 3-30%. The resultant infrared ray-transmitting glass is useful as a lens, etc., used in infrared ray area. |
