| 摘要 |
PROBLEM TO BE SOLVED: To make doped or undoped pure silica glass material. SOLUTION: (I) At least one stream of glass soot particles comprising silica is provided by a burner 315. (II) At least one stream of the glass soot particles is directed to an essentially planar deposition supporting surface of a deposition substrate 301 rotating about a rotation axis, such that at least one layer of glass soot is deposited on the deposition supporting surface to form a soot preform 303. In the step (II), the burner 315 is allowed to move relative to the deposition supporting surface, and the velocity of the burner 315 relative to the deposition supporting surface is modulated such that in at least half of the area of the layer of glass soot deposited, local soot density variation through at least the center half thickness is low. COPYRIGHT: (C)2007,JPO&INPIT
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