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US 6,632,757 B2Granted
Transparent forsterite glass-ceramics
AssigneeCorning Incorporated
InventorGeorge H. Beall
Life of this patent
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Abstract
A glass-ceramic which is substantially and desirably totally transparent, and which contains a predominant crystal phase of forsterite. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis: SiO2 30-60; Al2O3 10-25; MgO 13-30; K2O 8-20; TiO2 0-10; and GeO2 0-25. The glass-ceramic may be doped with up to 1 wt. % chromium oxide to impart optical activity thereto.
Claims10
An optically active telecommunications device comprising:
- a transparent glass-ceramic containing a predominant crystal phase of forsterite, said glass-ceramic having a composition, in weight percent on an oxide basis, comprising about:
- 30-60% SiO2;
- 10-25% Al2O3;
- 13-30% MgO;
- 8-20% K2O;
- 0-10% TiO2;
- 0-25% GeO2;
- with about 1% or less of Cr2O3;
- and said device exhibiting a fluorescence spectrum from about 800 nm to about 1550 nm, with a maximum within the range of about 900 nm to about 1400 nm.
6 more elements
Dependencies are inferred from the claim text.