Burner for producing glass fine particles.

摘要

A burner for producing glass fine particles has central, intermediate and outer passages (21, 22 and 24)with the end of the intermediate passage (22) disposed inwardly from the end of the outer passage (24) and the end of the central passage (21) disposed between the end of the intermediate passage (22) and the end of the outer passage (24). With this arrangement, e.g. graded refractive index distributions can be formed in the base material.