Abstract
Invention relates to laser equipment. Active medium for fiber lasers contains a structurally-activated
 epoxy oligomer with molecules of organic dyes and a hardener. Curing agent used is finely dispersed glass
 with chemically activated reactive groups on the surface with the following ratio of ingredients pts.wt.: organic dye 0.0075-01; epoxy oligomer 8.0-31.5; fine-dispersed glass with chemically activated surface 68.4925-91.9. Technical result consists in enabling adjustment of the value of the refractive index of the active fibre core.
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