TWI564263B

The invention provides optical glass, and an optical element and perform using the optical glass, wherein the optical glass can reduce fracture and cracks of the glass when pressure forming, thereby raising a production rate of the optical element. A maximum value (alpha max) of the linear dilatation coefficients in a temperature range between a glass transition temperature (Tg) and a yield point (At) of the optical glass is smaller than 1500*10-7K-1. As the optical glass, in embodiments, the optical glass may contain P5+,Al3+ and Ca2+ as cation components, and may contain O2-and F- as anion components.