| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical glass having a high refractive index suitable to be used for an optical element of a lens, prism or the like or for a substrate, in particular, suitable to be used for an optical element in a polarizing optical system or for a polarization controlling element of a PBS(polarizing beam splitter), SLM(spatial light modulator) or the like. SOLUTION: The optical glass contains SiO2 , PbO and B2 O3 and further contains >=0.1 mass% TeO2 and >=0.4 mass% Li2 O. Preferably, when the glass is 10±0.1 mm thick, the glass has 80% transmittance for light at <=420 nm wavelength, and the glass shows <=3.0% deterioration rate in the transmittance by the irradiation of rays in a UV region and/or visible region at 2.2 W.cm<-2> radiation illuminance for 10 minutes.
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