Patent ID: 6432854
Filing Date: 2002-08-13
Classification: C03C,G02B,Y10S

Abstract:
An optical glass for polarizing optical system having a photoelastic constant C in the range of âˆ’0.2 to +0.5 [10âˆ’8 cm2/N] with respect to a wavelength of 633 nm, the optical glass having the following composition (1):composition (1): when represented in terms of wt. % of oxides: SiO2: 17.0-27.0% (35.5-57.0 mol %) Li2O+Na2O+K2O: 0.5-5.0% (0.7-20.0 mol %) PbO: 72.0-75.0% (39.1-45.0 mol %) As2O3+Sb2O3: 0.1-3.0% (0.1-2.0 mol %).