Schott Ag

Holger Kasprzik

Uwe Kolberg

Ute Woelfel

Silke Wolff

A short optical glass is disclosed which is particularly suited for the applications imaging, projection, telecommunication, optical information technology and/or laser technology, also particularly suited for fiber applications (light guides or imaging guides). Preferably, the glass has a refractive index of 1.54&#x2266;n&#x2266;1.62 and an Abbe coefficient of 48&#x2266;v=57. It further has good attenuating and ion exchange characteristics, good chemical stability and good crystallization stability. The glass comprises 35 to 50 wt.-% SiO, 0.1 to 6 wt.-% BO, 0.1 to 7 wt.-% AlO, 0.1 to 4 wt.-% PO, 4 to 24 wt.-% RO (alkali oxides), 6 to 14.5 wt.-% BaO, 0 to 12 wt.-% other RO (alkaline earth oxides), 14 to 25 wt.-% ZnO, 0 to 5 wt.-% LaO, 0 to 10 wt.-% ZrO, wherein RO is an alkali oxide, RO is an alkaline earth oxide other than BaO, wherein LiO is 6 wt.-% at the most, wherein the glass does not contain any GeO, SnO, SnO, AgO, SbOand, preferably, no rare earth oxides, and wherein the glass may be molten while adding suitable purifying agents.

Boron aluminosilicate glass

A short optical glass is disclosed which does not comprise any silver, copper, thallium, lead or boron and is particularly suited for the application imaging, projection, telecommunication, optical information technology, and/or laser technology, also particularly suited for fiber applications (light guides or imaging guides). Preferably the glass has a refractive index of 1.55&#x2266;n&#x2266;1.65 and an Abbe coefficient of 48&#x2266;v&#x2266;57 and also has good attenuating and ion exchange characteristics, good chemical stability and good crystallization stability. The glass comprises 35 to &#x3c;50 wt.-% SiO; 1 to 10 wt.-% AlO; 5 to 15 wt.-% NaO+KO+CSO+LiO; 20 to 30 wt.-% BaO; 0 to 15 wt.-% ZnO; 0 to 10 wt.-% LaO; 0 to 10 wt.-% ZrO; 0 to 6 wt.-% PO; 0 to 8 wt.-% MgO+CaO+SrO; 0 to 3 wt.-% of other oxides, and CsO&#x3c;1, LiO&#x3c;1, and TiO&#x3c;1 wt.-%.

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Munich, Georgia

Holger Kasprzik