METHOD FOR MANUFACTURING POROUS GLASS PREFORM

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing porous glass preform capable of introducing fluorine compounds into a burner for depositing glass fine particles and depositing glass fine particles and adding fluorine simultaneously. SOLUTION: In the method for depositing glass fine particles by laminating and growing glass fine particle deposit layers radially on a starting rod, it is characterized by putting a fluorine compound gas with a flammable gas, a supporting gas, and a glass raw material gas into the burner.