Soot layer formation for solution doping of glass preforms

摘要

The reproducibility of preforms made by solution doping is significantly improved by adding an internal heat source, such as N₂O, as a processing gas during the soot deposition process. The addition of the internal heat source gas results in forming a surface soot layer which exhibits a relatively uniform and consistent morphology. The improvement in the soot surface morphology results in improving the uniformity of the amount of solution dopant retained in the soot layer from preform to preform.