Low-threshold, highly efficient $Gd^{3+}$, $Lu^{3+}$ co-doped $KY(WO_4)_2:Yb^{3+}$ planar waveguide lasers

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Geskus, D. and Aravazhi, S. and Bernhardi, E. and Grivas, C. and Harkema, S. and Hametner, K. and Günther, D. and Wörhoff, K. and Pollnau, M. (2009) Low-threshold, highly efficient $Gd^{3+}$, $Lu^{3+}$ co-doped $KY(WO_4)_2:Yb^{3+}$ planar waveguide lasers. Laser Physics Letters, 6 (11). pp. 800-805. ISSN 1612-2011

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Abstract:High-quality crystalline $KY(WO_4)_2:Yb^{3+}$ layers codoped with large concentrations of optically inert Gd3+ and Lu3+ ions were grown by liquid phase epitaxy. Continuous-wave laser operation in a planar waveguide configuration was observed at 1025 nm. For 23% output coupling, a maximum output power of 195 mW was obtained; a slope efficiency of 82.3% was derived, which to the best of our knowledge is the highest value yet reported for a planar waveguide laser to date. For 1.7% output coupling, a laser threshold as low as 18 mW of absorbed pump power was achieved, which is largely due to the enhanced refractive index contrast of ~$7.5\times 10^{-3}$ between the active layer and the undoped $KY(WO_4)_2$ substrate attained by the co-doping, leading to well-confined pump and laser modes
Item Type:Article
Copyright:© 2009 Wiley-VCH
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/69661
Official URL:http://dx.doi.org/10.1002/lapl.200910084
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