Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer

Xin Liu, Sönke Klinkhammer, Ziyao Wang, Tobias Wienhold, Christoph Vannahme, Peter-Jürgen Jakobs, Andreas Bacher, Alban Muslija, Timo Mappes, Uli Lemmer

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    Abstract

    Optically excited organic semiconductor distributed feedback (DFB) lasers enable efficient lasing in the visible spectrum. Here, we report on the rapid and parallel fabrication of DFB lasers via transferring a nanograting structure from a flexible mold onto an unstructured film of the organic gain material. This geometrically well-defined structure allows for a systematic investigation of the laser threshold behavior. The laser thresholds for these devices show a strong dependence on the pump spot diameter. This experimental finding is in good qualitative agreement with calculations based on coupled-wave theory. With further investigations on various DFB laser geometries prepared by different routes and based on different organic gain materials, we found that these findings are quite general. This is important for the comparison of threshold values of various devices characterized under different excitation areas. © 2013 Optical Society of America.
    Original languageEnglish
    JournalOptics Express
    Volume21
    Issue number23
    Pages (from-to)27697-27706
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2013

    Bibliographical note

    © 2013 OSA

    Keywords

    • Pumping (laser)
    • Distributed feedback lasers

    Cite this

    Liu, X., Klinkhammer, S., Wang, Z., Wienhold, T., Vannahme, C., Jakobs, P-J., Bacher, A., Muslija, A., Mappes, T., & Lemmer, U. (2013). Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer. Optics Express, 21(23), 27697-27706. https://doi.org/10.1364/OE.21.027697