Patent ID: 11958769

Abstract:
Disclosed are optical glass, a glass preform or an optical element made therefrom and an optical instrument. The optical glass is calculated by a mass percentage content relative to a total mass of glass converted by an oxide, and the optical glass includes: B2O3: 5˜25%, La2O3: 25−45%, Gd2O3: 15−35%, Y2O3: 0−10%, Yb2O3: 0˜10%, Nb2O5: 2−15%, SiO2: 0.5˜15%, ZrO2: 1−15%, TiO2: 0.5˜10% and WO3: 0˜10%, a weight ratio of Nb2O5 to TiO2, i.e., Nb2O5/TiO2, is 2.17−8.5, and Ta2O5 is not contained.