Highly efficient lasers and amplifiers in double tungstates

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

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

    Abstract

    The double tungstates KY(WO4)2, KGd(WO4)2, and KLu(WO4)2 are excellent candidates for solid-state lasers because of the large transition cross-sections of optically active rare-earth ions doped into these hosts. We grow actively doped KY1-x-yGdxLuy(WO4)2 layers onto KY(WO4)2 substrates by liquid-phase epitaxy. Co-doping the layers with optically inert Gd3+ and Lu3+ ions simultaneously allows for lattice matching and enhanced refractive index contrast with respect to the substrate. Low-loss channel waveguides are microstructured into the layers by Ar+-beam etching, resulting in strong pump- and signal-mode confinement. Yb-doped channel waveguide lasers deliver 650 mW output power at 1 µm. Record-high slope efficiency (85%) and record-low quantum defect (0.7%) for dielectric lasers are achieved. In pump-signal experiments, exploiting highly doped KGd0.447Lu0.078Yb0.475(WO4)2 channel waveguides, we demonstrate a giant optical gain of 950 dB/cm, exceeding the gain previously reported in rare-earth-ion-doped materials by two orders of magnitude and comparable to the gain obtained in semiconductor optical amplifiers.
    Original languageUndefined
    Title of host publicationJoint Annual Meeting of the Swiss Physical Society and the Austrian Physical Society
    Place of PublicationBasel
    PublisherSwiss Physical Society
    PagesPaper 627
    Number of pages1
    ISBN (Print)not assigned
    Publication statusPublished - Jun 2011
    EventJoint Annual Meeting of the Swiss Physical Society and the Austrian Physical Society 2011: Joint Annual Meeting of the Swiss Physical Society and the Austrian Physical Society - EPF, Lausanne, Switzerland
    Duration: 15 Jun 201117 Jun 2011
    https://www.sps.ch/en/events/joint-annual-meeting-2011/

    Publication series

    NameBulletin SPG / SSP
    PublisherSwiss Physical Society
    Volume28

    Conference

    ConferenceJoint Annual Meeting of the Swiss Physical Society and the Austrian Physical Society 2011
    CountrySwitzerland
    CityLausanne
    Period15/06/1117/06/11
    Internet address

    Keywords

    • METIS-277670
    • EWI-20246
    • IOMS-APD: Active Photonic Devices
    • IR-77564

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