Thulium-doped silica fibers with enhanced 3H4 level lifetime: modelling   the devices for 800-820 nm band
  Silica-based thulium-doped fiber devices operating around 810 nm would extend the spectral range covered by high- power fiber devices. Using a comprehensive numerical model of the fiber we have shown that efficient lasing at 810 nm can be achieved for specific ranges of the laser cavity parameters in silica-based thulium-doped fibers with enhanced 3H4 lifetime up to 58 \mus as measured in our highly alumina-codoped fibers. We present optimization of the thulium-doped fiber and laser cavity parameters and also potential applications of the developed host material in amplifiers and broadband sources. 
Pavel Peterka, Ivan Kasik (IPE), Anirban Dhar (IPE), Bernard   Dussardier (LPMC UMR 7336), Wilfried Blanc (LPMC)
physics.optics