Integrated lasers in crystalline double tungstates with focused-ion-beam nanostructured photonic cavities

F. Ay, I. Inurrategui, D. Geskus, S. Aravazhi, Markus Pollnau

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    Deeply etched Bragg gratings were fabricated by focused ion beam (FIB) milling in KGdxLu1-x(WO4)2:Yb3+ to obtain photonic cavity structures. By optimizing parameters such as dose per area, dwell time and pixel resolution the redeposition effects were minimized and grating structures more than 4 µm in depth with an improved sidewall angle of ~5 degrees were achieved. Fabry-Perot microcavities were defined and used to assess the optical performance of the grating structures at ~1530 nm. An on-chip integrated laser cavity at ~980 nm was achieved by defining a FIB reflective grating and FIB polished waveguide end-facet. With this cavity, an on-chip integrated waveguide laser in crystalline potassium double tungstate was demonstrated.
    Original languageUndefined
    Pages (from-to)423-430
    Number of pages8
    JournalLaser physics letters
    Issue number6
    Publication statusPublished - Jun 2011


    • EWI-19804
    • crystalline potassium double tungstate
    • Optical waveguides
    • integrated cavity
    • on-chip integrated laser
    • Waveguide laser
    • Focused ion beam nanostructuring
    • IR-76407
    • METIS-277582
    • IOMS-APD: Active Photonic Devices

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