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r-GRIN glass rods prepared by a sol-gel method |
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| Authors: | S. Konishi K. Shingyouchi A. Makishima |
| Affiliation: | 1 Cable Research Laboratory, Hitachi Cable Ltd, 5-1-1 Hitaka-cho, Hitachi, Ibaraki, Japan 2 National Institute for Research in Inorganic Materials, Sakura-mura, Niiharu-gun, Ibaraki, Japan |
| Abstract: | Preparation of radial gradient refractive index (r-GRIN) glass rods has been undertaken by a sol-gel process using metal alkoxides. Two binary systems, Si(OCH3)4---Ge(OC2H5)4 and Si(OCH3)4−Ti(O−n-C4H9)4 have been investigated. It has been shown that immersion of rod-shaped wet gels in neutral or acidic water gives rise to leaching of the dopants (germanium and titanium components). Since this leaching is controlled predominantly by diffusion, the dopants remaining in the gels are expected to form concentration gradients. Optical measurements of the glass rods obtained after drying and sintering of the leached gels have shown that the concentration gradients are retained in the glass rods and they give r-GRIN profiles. |
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