11 October 2005 Power scaling of cladding-pumped Er,Yb-doped fiber lasers at 1.5 μm
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An efficient double-clad erbium-ytterbium co-doped fiber laser pumped by two high-power diode-stacks at 975nm is reported. Using a simple external cavity configuration at one end of the fiber and the 3.6% Fresnel reflection from a cleaved fiber end facet at the opposite end of the fiber to provide the necessary feedback for lasing, we obtained a maximum output power of 159W at 1565nm in a beam with beam quality factor (M2) ~1.9 for 466W of launched pump power. The corresponding slope efficiency with respect to launched pump power was 34%. The maximum output power was limited by the available pump power. A strategy for increasing the output power and improving the beam quality based on the use of a double-clad fiber design with a helical-core trajectory is considered.
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W. Andrew Clarkson, Deyuan Shen, Pu Wang, Laurence J. Cooper, Johan Nilsson, Jayanta K. Sahu, "Power scaling of cladding-pumped Er,Yb-doped fiber lasers at 1.5 μm", Proc. SPIE 5958, Lasers and Applications, 59580O (11 October 2005); doi: 10.1117/12.623660; https://doi.org/10.1117/12.623660

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