A process for the continuous production of a glass rod, in particular for the production of laser dies or preforms for the pulling of optical fibers.

摘要

The invention concerns the manufacture of glass bars. / p & & p & it relates to a process for the production of a glass bar halide, in particular fluorinated, characterized in that it comprises the following operations: - are distributed in a powder 6 consisting of a mixture of halogenated compounds on a support 1 which is displaceable continuously vertically from top to bottom, said support being placed at the beginning of the operation of the process, inside a container 4 having a cylindrical inner cavity 5 of the upper section of a few tens of microns to that of the bar to be carried out, said container comprising heating means 4a, in order to ensure the melting of the pulverulent material; - there is injected continuously between the bar in the formation and the wall of said cylindrical cavity 5, a gas, so as to produce a layer 7 of gas from a few tens of microns in thickness at a pressure greater than the medium surrounding the container and adjusted continuously, so as to avoid any contact between the material of the bar and the inner wall of the container; - heating the upper part of the bar in the formation of such a way as to create a zone 12 in which the viscosity of the material is of the order of a poise, promoting the removal of the microbubbles. / p & & p & application to the construction of matrices laser or preforms for optical fiber drawing.