Abstract

A $64\mathrm{W}$ fiber laser at $1.9\mu \mathrm{m}$ with a slope efficiency of 68% with respect to the launching pump power at $800\mathrm{nm}$ was demonstrated in a one-end pump configuration using a piece of $20\mathrm{cm}$ 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 $104\mathrm{W}$ at $1.9\mu \mathrm{m}$ was demonstrated from a piece of $40\mathrm{cm}$ long fiber with a dual-end pump configuration.

© 2007 Optical Society of America

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