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

D. Geskus, S. Aravazhi, Edward Bernhardi, C. Grivas, Sybolt Harkema, K. Hametner, D. Günther, Kerstin Worhoff, Markus Pollnau

    Research output: Contribution to journalArticleAcademicpeer-review

    60 Citations (Scopus)


    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
    Original languageUndefined
    Article number10.1002/lapl.200910084
    Pages (from-to)800-805
    Number of pages6
    JournalLaser physics letters
    Issue number11
    Publication statusPublished - 7 Aug 2009


    • EWI-17280
    • IR-69661
    • METIS-264490
    • IOMS-APD: Active Photonic Devices

    Cite this