Gradient-index optical element and its fabrication method
US6174828A · kind A · utility
6Cited by
10References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 29, 1998 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Jul 29, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2203/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A gradient-index optical element comprises SiO.sub.2, BaO, and TiO.sub.2 as essential components, and has a refractive index profile in its diametrical direction. The molar ratio of barium to silicon at the center of the element in its diametrical direction is limited to Ba/Si.gtoreq.0.4. This gradient-index optical element has a small refractive index difference with reduced chromatic aberrations and, hence, is suitable for use with optical equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.