| 摘要 |
PURPOSE: To make the photoelasticity constant C of optical glass practically zero to a common wavelength range of incident light by incorporating SiO2 , R2 O (R is Li, Na or K), RF, R2 SiF6 , PbO, PbF2 , As2 O3 and Sb2 O3 . CONSTITUTION: Oxides, fluorides, carbonates, nitrates, etc., of the components of optical glass as starting materials are weighed and mixed so as to give a compsn. consisting of, by mol, 40.0-54.0% SiO2 , 0.5-9.0% R2 O (R is Li, Na or K), 0-16.0% RF, 0-3.3% R2 SiF6 , 43.0-45.5%, in total, of PbO and 0-10.0% PbF2 and 0-1.5%, in total, of As2 O3 and Sb2 O3 and satisfying 0.1<=F/O<=18.0. The resultant starting material mixture is melted by heating to 1,000-1,300 deg.C, refined, homogenized by stirring, cast in a preheated metal mold and slowly cooled to obtain the objective optical glass whose photoelasticity constant C is practically zero to 0.4-3.0μm wavelength of incident light.
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