Abstract
We have demonstrated a homemade high-efficient ytterbium-doped fiber laser with up to 1.75 kW of continuous-wave output power at 1.09 μm with a slope efficiency of 76%. The fiber is pumped by two laser diode array (LDA) sources launched through opposite ends. No undesirable effect is observed with increasing pump power, which suggests that the homemade fiber laser could produce higher power output by using more pump sources. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1668–1671, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25226
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