Efficient channel waveguide lasers based on thulium-doped double tungstates

Koop van Dalfsen, S. Aravazhi, D. Geskus, Sonia Maria García Blanco, Kerstin Worhoff, Markus Pollnau

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic


    Monoclinic double tungstates, KY(WO4)2 (= KYW), co-doped with Gd3+, Lu3+and various Tm3+ concentrations of 1.5 - 8.0% were grown onto pure KYW substrates by liquid-phase epitaxy. Ridge-type channel waveguides were microstructured 1.5 μm deep by Ar+-beam milling and overgrown with pure KYW. Lifetime measurements on the upper laser level (3F4) were performed for the different concentrations. Laser experiments on the 1.5% Tm3+-doped channel waveguides revealed slope efficiencies as high as 31.5% and output powers up to 149 mW. Through measurements of the laser relaxation-oscillation frequency, an upper value of ~0.11 dB/cm for the waveguide propagation loss at the laser wavelength was determined.
    Original languageUndefined
    Title of host publicationProceedings of the 2011 Annual Symposium of the IEEE Photonics Benelux Chapter
    Place of PublicationGhent, Belgium
    PublisherGhent University
    Number of pages4
    ISBN (Print)978-90-76546-00-1
    Publication statusPublished - 1 Dec 2011
    Event16th Annual Symposium of the IEEE Photonics Benelux Chapter 2011 - Ghent, Belgium
    Duration: 1 Dec 20112 Dec 2011
    Conference number: 16

    Publication series

    PublisherDepartment of Information Technology, Ghent University


    Conference16th Annual Symposium of the IEEE Photonics Benelux Chapter 2011
    Internet address


    • METIS-285002
    • EWI-21271
    • IOMS-APD: Active Photonic Devices
    • IR-79365

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