Abstract
A single-mode laser is demonstrated using a newly developed double-clad
thulium-ytterbium-doped fiber (TYDF) in a linear cavity formed by two fiber Bragg
gratings (FBGs). The YTF used is drawn from a D-shape preform fabricated using the
modified chemical vapor deposition and solution doping technique. The laser is
operated at 1 901.6 nm via the transition of thulium ions from
<sup>3</sup>F<sub>4</sub> to <sup>3</sup>H<sub>6</sub> with the assistance of
ytterbium to thulium ion energy transfer. The efficiencies of the laser are 0.71%
and 0.75% at 927- and 905-nm multimode pumping, respectively. The thresholds of the
launched pump power for 927- and 905-nm pumping are 1 314 and 1 458 mW,
respectively. A 7-mW output is obtained at a 905-nm pump power of 2 400 mW.
© 2012 Chinese Optics Letters
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