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
Lasers and Laser Optics
S. W. Harun, A. Halder, M. C. Paul, S. M. M. Ali, N. Saidin, S. S. A. Damanhuri, H. Ahmad, S. Das, M. Pal, and S. K. Bhadra, "Ytterbium-sensitized thulium-doped fiber laser with a single-mode output operating at 1 900-nm region," Chin. Opt. Lett. 10, 101401-101401 (2012)