| 摘要 |
PURPOSE:To produce a base material for an optical fiber with good productivity by placing a bar-shaped glass body into a plastic mold having stretchability, packing a pulverous glass particle material having a different refractive index around the same and pressurizing uniformly the plastic mold from the outside to one body then heating the material to vitrify the same to transparent glass. CONSTITUTION:The bar-shaped body 6 of the glass having an optional refractive index is put into the plastic mold 5 consisting of silicone rubber or the like having excellent stretchability and the pulverous glass particles 4 which consists essentially of the SiO2 obtd. by the hydrolysis, flame hydrolysis or thermal oxidation of halide of Si such as SiCl4 or alkoxy compd. and diffused with F and has the refractive index different from the refractive index of the body 6 are backed around the body 6. The plastic mold 5 is put into a pressurizing device 7 and the mold 5 is uniformly pressurized from the outside by a hydrostatic pressurizing method using water 8 to press-weld the particles 4 to the circumference of the body 6. The body is then heated in a heating furnace and is vitrified to transparent glass, by which the base material for the optical fiber is produced. |
