OPTICAL GLASS

摘要

Disclosed is optical glass which has low deformation point and high refractive index and is suitable for mold press forming, especially for glass imprinting of a nanostructure. Specifically disclosed is optical glass which contains, in terms of oxides, 15-30% by mole of P2O5, 5-35% by mole of Bi2O3 and 40-75% by mole of ZnO, while containing halogen (X), which is composed of chlorine (Cl) and/or bromine (Br), at a molar ratio relative to oxygen, namely X/O of 0.005-0.5. In addition, the optical glass contains one or more alkali metal elements (R), which are selected from among lithium, sodium and potassium, in the form of R2O in an amount of 15% by mole or less. The optical glass contains the halogen (X), which is composed of chlorine (Cl) and/or bromine (Br), in the form of ZnX2 or RX.