Rare-earth activated potassium double tungstate waveguide amplifiers and lasers

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

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

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    Several fields, including optical communications, bio-sensing, health, and safety, will greatly benefit from on-chip high-gain amplifiers and high-power, compact, efficient, tunable or short-pulse lasers in channel waveguide geometry. The rare-earth (RE) doped potassium double tungstates KY(WO4)2, KGd(WO4)2, and KLu(WO4)2 are very promising candidates for such applications. RE ions exhibit a long excited-state lifetime, typically ranging from hundreds of microseconds to milliseconds, thus permitting large excitation densities and distortion-free amplification of high-bit-rate signals in the small-signal-gain regime. The large interionic separation of ~0.5 nm of RE ions in double tungstates allows to exploit increased RE dopant concentrations without significant fluorescence quenching, which, together with the large absorption and emission cross-sections of RE ions in these host materials and the good overlap between pump and signal light provided by the optimization of the channel waveguide structure, leads to very high modal gain. In this paper, our recent achievements in integrated waveguide amplifiers and lasers will be presented. When activated with Yb3+, lasers with low threshold of a few mW, high slope efficiency of 76%, high output power of ~650 mW, tunability between 980-1045 nm, and low quantum defect of 0.7% were demonstrated. A high-gain waveguide amplifiers presenting a modal gain of ~935 dB/cm was achieved. In Tm3+-doped waveguides, 31% slope efficiency and 149 mW output power at 1.9 µm were obtained. Finally, potential applications of this material in nanophotonic devices will be highlighted.
    Original languageUndefined
    Title of host publicationPhotonics West 2012
    Place of PublicationUSA
    Number of pages1
    ISBN (Print)not assigned
    Publication statusPublished - Jan 2012
    EventSPIE Photonics West 2012 - The Moscone Center, San Francisco, United States
    Duration: 21 Jan 201226 Jan 2012

    Publication series

    NameOptics express
    ISSN (Print)1094-4087


    ConferenceSPIE Photonics West 2012
    CountryUnited States
    CitySan Francisco
    Other21-27 January 2012
    Internet address


    • METIS-286357
    • IOMS-APD: Active Photonic Devices
    • EWI-21847
    • IR-80406

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