A single-mode Nd3+-doped tellurite glass fiber laser operating at 1.06
1 mu m is described. We believe this is the first demonstration of a s
ingle-mode fiber laser in tellurite glass. A lasing threshold of 27 mW
of 818-nm absorbed pump power and a slope efficiency output power ver
sus pump power of 23% emitted from one end were observed in the fiber
cavity with 11.9% Fresnel reflection at both ends.