Abstract
A fiber laser at with a slope efficiency of 68% with respect to the launching pump power at was demonstrated in a one-end pump configuration using a piece of long newly developed thulium-doped germanate glass double-cladding single-mode fiber. A quantum efficiency of 1.8 was achieved. An output laser power of at was demonstrated from a piece of long fiber with a dual-end pump configuration.
© 2007 Optical Society of America
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