Growth, characterization, and waveguide lasing of Yb3+, Lu3+, Gd3+ co-doped KY(WO4)2 thin layers

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

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    Abstract

    Monoclinic crystals of KY(WO4)2 (KYW) doped with different rare-earth ions are among the highly promising materials for building compact solid-state lasers. We report the liquid phase epitaxy (LPE) growth of 3-5 µm thick KYW:Gd3+, Lu3+, Yb3+ layers for Yb3+ concentrations of 1.2, 1.7, and 2.4 mol% and 30 to 40-µm-thick KYW:Gd3+, Yb3+ (20 mol%) layers. The concentration of the dopants Yb3+, Lu3+, and Gd3+ in the grown film were determined by laser ablation inductively coupled plasma - mass spectrometry (LA-ICP-MS). The growth conditions were optimized, leading to crack-free layers for all investigated Yb3+ concentrations. X-ray investigations have confirmed the high crystallinity of the films. Based on the Gd3+, Lu3+ co-doped thin films, planar waveguide lasers operating on the Yb3+ transition at 1025 nm were demonstrated. Due to the co-doping, resulting in high refractive-index difference between film and substrate, very thin waveguides with strong light confinement were obtained, thus allowing for a pump threshold of laser operation as low as 18 mW. The highest slope efficiency versus absorbed pump power and output power were 82.3% and 195 mW, respectively.
    Original languageUndefined
    Title of host publicationInternational Commission for Optics (ICO) Topical Meeting on Emerging Trends and Novel Materials in Photonics
    Place of PublicationGreece
    PublisherInternational Commission for Optics (ICO)
    Pages142
    Number of pages1
    ISBN (Print)not assigned
    Publication statusPublished - 7 Oct 2009
    EventInternational Commission for Optics (ICO) Topical Meeting on Emerging Trends and Novel Materials in Photonics 2009 - Delphi, Greece
    Duration: 7 Oct 20099 Oct 2009

    Publication series

    NameConference Program and Book of Abstracts
    PublisherInternational Commission for Optics (ICO)

    Conference

    ConferenceInternational Commission for Optics (ICO) Topical Meeting on Emerging Trends and Novel Materials in Photonics 2009
    CountryGreece
    CityDelphi
    Period7/10/099/10/09

    Keywords

    • METIS-265818
    • IOMS-APD: Active Photonic Devices
    • EWI-17527
    • IR-70071

    Cite this

    Aravazhi, S., Geskus, D., Gunther, D., Worhoff, K., & Pollnau, M. (2009). Growth, characterization, and waveguide lasing of Yb3+, Lu3+, Gd3+ co-doped KY(WO4)2 thin layers. In International Commission for Optics (ICO) Topical Meeting on Emerging Trends and Novel Materials in Photonics (pp. 142). (Conference Program and Book of Abstracts). Greece: International Commission for Optics (ICO).