| 摘要 |
PURPOSE:To obtain stably and easily light transmission glass having refractive index gradient, by adding a metal alkoxide to raise refractive index to a specific silicon alkoxide solution to give wet gel, and immersing the gel in an organic solvent containing a metal alkoxide to reduce refractive index. CONSTITUTION:At least one of a metal alkoxide of elements of Ge, P, Al, etc. to raise refractive index of transparent quartz glass is added to a solution of a silicon alkoxide shown by the formula Si(OR)4 (R is alkyl), which is hydrolyzed to give wet gel with a given shape. Then, the swollen gel is immersed in an organic solvent (methanol, etc.) containing a metal alkoxide of B to reduce refractive index of transparent quartz glass. After the wet gel is provided with refractive index distribution in this way, it is processed into dry gel by a given method, and made into glass by calcination. Consequently, a light transmission glass material having refractive index continuously reducing from the center towards the peripheral face is produced.
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