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Optical glass based on oxides of silicon, boron and lanthanum - having high index of refraction and low dispersion
Optical glass based on oxides of silicon, boron and lanthanum - having high index of refraction and low dispersion
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机译:基于硅,硼和镧的氧化物的光学玻璃-具有高折射率和低色散
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摘要
Optical glass contains 51-74 mole % of (SiO2 + B2O3 + La2O3). The molar ratio SiO2:La2O3 is 0.33-0.66 (pref. 0.39-0.63, esp. 0.59); B2O3:La2O3 is 0.46-0.86 (pref. 0.50-0.74, esp. 0.59). Glass having high index of refraction (nD=1.84-1.95) and low Abbe number (nu d = 33-43) can be produced on industrial scale at a low cost. The prodn. is facilitated in that the compsn. does not much deviate from the eutectic point so that the fusion temp. is relatively low. The glass does not contain the objectionable thorium oxide (which is often used in commercial glasses having high index of refraction).
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机译:光学玻璃包含51-74摩尔%的(SiO 2 + B 2 O 3 + La 2 O 3)。 SiO 2 ∶La 2 O 3的摩尔比为0.33-0.66(优选为0.39-0.63,尤其是0.59); B 2 O 3:La 2 O 3为0.46-0.86(优选0.50-0.74,尤其是0.59)。具有高折射率(nD = 1.84-1.95)和低阿贝数(nud = 33-43)的玻璃可以工业规模以低成本生产。产品便利之处在于compsn。不会从共晶点偏离太多,因此熔化温度。相对较低。该玻璃不含有害的氧化or(常用于具有高折射率的商用玻璃中)。
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