Abstract
We report on transverse-fundamental-mode CW output near from a heavily erbium-doped ZBLAN double-clad fiber laser pumped by a collimated laser diode array. The pump threshold of the fiber laser was about , and the slope efficiency was 21.3%. The peak wavelength of free running was about at low pump power and moved to around at high pump power. Output of was obtained when the launched pump power was . The output, however, fluctuated intensively like a pulsed laser, and the operation broke down with optical damage of the pumping end facet when the pump was increased beyond . Therefore, alleviation of the operation fluctuation, heat management, and strengthening the pumping fiber are crucial considerations for the stable operation of 10-W-level mid-IR ZBLAN fiber lasers.
© 2006 Optical Society of America
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