Abstract
The chemical composition of lead-alcali-silicate glasses was changed so that with usual raw material, and under standard production, conditions of optical glasses, the absorption loss was markedly lower compared with known glasses. In table 1, the absorption losses are compared which are caused by 1 ppm of the impurity embedded in the new flint glass (F-special) and in a SiO2-Na2O glass (1) respectively, in the case of the special flint glass much higher concentrations are allowed to cause a certain loss than in the other glass type.
© 1975 Optical Society of America
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