Abstract
In this paper, we report for the first time efficient single-mode cw operation in 2 mum range of thulium-doped silica fiber laser with core pumping at lambda=1230 nm. We also investigated the possibility of direct pumping from Yb-doped fiber laser without Raman converter (using the short wavelength wing of 1.21 mum absorption band of Tm3+ ions). The results obtained demonstrate the possibility of high-power Tm fiber laser pumping with the radiation of the long-wavelength wing of the 1.21 mum transition in the Tm3+ ion
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