A method of fluorine doped quartz glass

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The invention describes a method for the manufacture of quartz glass that comprises not only doping with rare earth elements and/or transition metals, but also fluorination of the quartz glass. The method described presently allows the diffusion of the dopants during fluorination to be prevented. Moreover, the invention relates to the quartz glass that can be obtained according to the method according to the invention and the use thereof as laser-active quartz glass, for generating light-guiding structures, and in optical applications.