High-power, broadly tunable, and low-quantum-defect KGd1-xLux(WO4)2:Yb3+ channel waveguide lasers

Dimitri Geskus, Shanmugam Aravazhi, Kerstin Worhoff, Markus Pollnau

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    In KGd1-xLux(WO4)2:Yb3+ channel waveguides grown onto KY(WO4)2 substrates by liquid phase epitaxy and microstructured by Ar+ beam etching, we produced 418 mW of continuous-wave output power at 1023 nm with a slope efficiency of 71% and a threshold of 40 mW of launched pump power at 981 nm. The degree of output coupling was 70%. By grating tuning in an extended cavity and pumping at 930 nm, we demonstrated laser operation from 980 nm to 1045 nm. When pumping at 973 nm, lasing at 980 nm with a record-low quantum defect of 0.7% was achieved.
    Original languageEnglish
    Pages (from-to)26107-26112
    Number of pages6
    JournalOptics express
    Issue number25
    Publication statusPublished - Dec 2010


    • IOMS-APD: Active Photonic Devices
    • Channeled
    • Waveguides
    • Lasers
    • Ytterbium

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