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Low-threshold and highly efficient Gd3+, Lu3+ co-doped KY(WO4)2: Yb3+ planar waveguide lasers

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Co-doping with optically inert Gd3+ and Lu3+ ions improves refractive-index contrast and light confinement in KY(WO4)2: Yb3+ planar waveguides. Lasing with 18 mW threshold and record-high slope efficiency of 82.3% versus absorbed pump power is demonstrated.

© 2010 Optical Society of America

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