METHOD FOR FORMING FINE GLASS PARTICLE DEPOSIT

摘要

PROBLEM TO BE SOLVED: To provide a method for forming a fine glass particle deposit by adding a dopant (F) simultaneously; not by impregnating the dopant by heating the fine glass particle deposit formed already under the atmosphere of the dopant lowering the refractive index. SOLUTION: A fine glass particle deposit with a lower refractive index than that of the core base glass is formed by the OVD or VAD method around the periphery of the core base glass. The glass deposit added by the dopant is formed by passing the material gas (CF4) of the dopant lowering the refractive index together with the glass material through the port of the burner synthesizing the fine glass particle, where the glass material is also passed. This method reduces the production cost by cutting the process impregnating the dopant under its atmosphere into the fine glass particle deposit formed without the addition of the dopant. COPYRIGHT: (C)2003,JPO