PROCESS FOR THE CONTINUOUS PRODUCTION OF A GLASS BAR, IN PARTICULAR FOR THE PRODUCTION OF LASER MATRICES OR PREFORMS FOR OPTICAL FIBER DRAWING

摘要

The invention relates to the manufacture of halogenated glass rods. It relates to a process for the production of a halogenated glass rod, in particular a fluorinated glass rod, characterized in that it comprises the following operations: - a powder 6 consisting of a mixture of halogenated products is continuously dispensed on a support 1 continuously displaceable vertically from top to bottom, said support being placed, at the beginning of the start of the process, at interior of a container 4 having a cylindrical inner cavity of greater cross section a few tens of microns than that of the bar to be produced, said container comprising heating means 4A to ensure the melting of the powder material; a gas is continuously injected between the forming bar and the wall of said cylindrical cavity 5 so as to produce a layer 7 of gas a few tens of microns thick at a pressure greater than that surrounding the container; and continuously adjusted so as to avoid any contact between the material of the bar and said inner wall of the container; the upper part of the bar is shaped to form a zone 12 in which the viscosity of the material is of the order of the poise, favoring the elimination of the microbubbles. / P P Application to the embodiment laser dies or optical fiber preforms. / P