Abstract
The refractive index distribution shape of SiO2-TiO2-BaO-K2O systems r-GRIN lens can be controlled by the kind of solvent used for providing of concentration distribution process of barium. The expansion of the concentration difference of barium was also examined. The kind of solvent used in providing of concentration distribution process has a significant influence on the refractive index distribution shape in terms of Δn or N20′. Solvents which enable to large Δn was aliphatic ether, having an ether bond as a functional group. In this case, the dielectric constant of these solvents was between 3 and 6. A mixture solvent of methanol and di-isopropyl ether was suitable as a solvent to expand the Δn of r-GRIN lens.
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