The laser active use of quartz glass and production method

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Production of blanks for laser-active quartz glass components comprises : (A) preparing a suspension with a solids content of at least 40 wt.% which contains silica nanopowder and dopants containing a rare earth cation and transition metals; (B) granulation by stirring while removing water to form silica granules consisting of spherical, porous grains which have a moisture content below 35% and a density of at least 0.95 g/m2>; (C) drying and purifying the granules by heating to at least 1000[deg]C to form doped, porous silica grains with an OH content below 10 ppm; and (D) sintering or melting the doped grains in a reducing atmosphere.