Dependence of quantum efficiency and core propagation loss on doping concentration in Tm-doped silica fibers.

A set of six thulium-doped aluminosilicate fibers with Tm3+-doping level ranging from 0.4 to 4.8 wt.% was fabricated, characterized, and investigated. By maintaining a similar aluminium content across fiber samples, it was possible to study the effec…

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