OPTICAL GLASS, OPTICAL ELEMENT AND OPTICAL GLASS MATERIAL

摘要

[Problem] The purpose of the present invention is to provide: optical glass that has relatively high refractive index and excellent thermal stability; an optical element which is composed of this optical glass; and an optical glass material. [Solution] Optical glass having a total content of P2O5, B2O3 and Al2O3 of 55% by mass or less, which contains one or more substances selected from among BaO, MgO, CaO, ZnO and SrO and one or more substances selected from among Gd2O3, Y2O3, La2O3 and Yb2O3, and wherein: the content of ZnO is 15% by mass or less; the mass ratio α1 of the BaO content to the total content of MgO, CaO, ZnO and SrO is 2.1 or less; the mass ratio β1 of the total content of P2O5, B2O3 and Al2O3 to the total content of Gd2O3, Y2O3, La2O3 and Yb2O3 is less than 4.80; the refractive index nd is 1.620-1.700; and the Abbe number νd is 53-65.