Optical glass, preparation method thereof and optical element

The invention provides optical glass, a preparation method thereof and an optical element. The optical glass comprises the following components in percentage by mass: 10.0% to 30.0% of B2O3; 3.0% to 9.5% of SiO2; 15.0% to 30.0% of La2O3; 15.0% to 30.0% of Gd2O3; 0% to 5.0% of Y2O3; 0% to 6.0% of ZrO2; 0.1% to 4.8% of Nb2O5; 0% to 6.0% of Ta2O5; 10.0% to 22.0% of ZnO ; 0% to 3.0% of Li2O; 0%-3.0% of WO3; and 0% to 1.0% of Sb2O3; and the sum of the percentages of the components is 100%. The refractive index nd of the optical glass is more than 1.80, and the Abbe number upsilond of the optical glass is more than 45. The optical glass disclosed by the invention has relatively low transition temperature Tg and sag temperature Ts, and relatively low forming temperature. 本发明提供一种光学玻璃及其制备方法以及光学元件。光学玻璃以质量％计含有以下组分：B2O3：10.0％～30.0％；SiO2：3.0％～9.5％；La2O3：15.0％～30.0％；Gd2O3：15.0％～30.0％；Y2O3：0％～5.0％；ZrO2：0％～6.0％；Nb2O5：0.1％～4.8％；Ta2O5：0％～6.0％；ZnO：10.0％～22.0％；Li2O：0％～3.0％；WO3：0％～3.0％；Sb2O3：0％～1.0％；上述各组分之和为100％；所述光学玻璃的折射率nd为1.80