Optical fibers for use as laser medium in fiber lasers comprise core which is doped with laser-activ

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The invention relates to an optical fiber in a fiber laser for use as laser medium, in particular high performance fiber laser, comprising a core, doped with laser-active material, in particular Rarely- earth atoms, a jacket, surrounds the core has the, wherein the sheath includes microstructuring and the material for the fiber core and/or cladding is selected from lithium and aluminum-containing silicate glasses, heavy metal-oxide-glass, quartz-glass, phosphate glasses, [...] glasses, glasses and/or glass-ceramic with domains, based on the designated glasses. according to invention High Deploying-fiber laser, the comparable power densities with solid-state lasers have.