Improved-index-contrast KY(WO4)2:Gd, Lu, Yb epitaxial waveguides suitable for highly efficient waveguide lasing

S. Aravazhi, D. Geskus, Kerstin Worhoff, Markus Pollnau

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    High-quality crystalline KY(WO4)2:Yb3+ layers co-doped with large concentrations of optically inert Gd3+ and Lu3+ ions were grown by vertical liquid phase epitaxy. The codoping enhances the refractive index contrast between the active layer and the undoped KY(WO4)2 substrate to ~7.5×10-3. A K2W2O7 solvent was employed for the growth of layers onto undoped (010)-oriented KYW substrates. Single crystalline layers of thickness 5-10 µm were grown at low level of supersaturation and growth temperatures of 920-923°C. The layer quality was studied by X-ray diffraction. The composition of the grown layers was determined by laser-ablation inductively-coupled-plasma mass spectrometry (LA-ICP-MS). Planar waveguide lasers with low laser threshold of 18 mW, record-high slope efficiency of 82.3%, and maximum output power of 195 mW have been achieved.
    Original languageUndefined
    Title of host publicationProceedings of the 2009 Annual Symposium of the IEEE Photonics Benelux Chapter
    EditorsStefano Beri, Philippe Tassin, Gordon Craggs, Xaveer Leijtens, Jan Dankaert
    PublisherVUBPress Brussels University Press
    Number of pages4
    ISBN (Print)978-90-5487-650-2
    Publication statusPublished - 5 Nov 2009
    Event14th Annual Symposium of the IEEE Photonics Benelux Chapter 2009 - Brussels, Belgium
    Duration: 5 Nov 20096 Nov 2009
    Conference number: 14

    Publication series

    PublisherVUBPress Brussels University Press


    Conference14th Annual Symposium of the IEEE Photonics Benelux Chapter 2009


    • IR-69943
    • METIS-265796
    • Crystal growth
    • epitaxial
    • IOMS-APD: Active Photonic Devices
    • LPE
    • KYW
    • EWI-17451
    • Laser

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