Lasing in dye-doped high-Q conical polymeric microcavities

Tobias Grossmann, Simone Schleede, Mario Hauser, Mads Brøkner Christiansen, Christoph Vannahme, Carsten Eschenbaum, Sönke Klinkhammer, Torsten Beck, Jochen Fuchs, G. Ulrich Nienhaus, Uli Lemmer, Anders Kristensen, Timo Mappes, Heinz Kalt

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    We report on lasing in conical microcavities, which are made out of the low-loss polymer poly (methyl methacrylate) (PMMA) doped with the dye rhodamine 6G, and directly fabricated on silicon. Including a thermal reflow step during fabrication enables a significantly reduced surface roughness, resulting in low scattering losses of the whispering gallery modes (WGMs). The high cavity quality factors (above 2·106 in passive cavities) in combination with the large oscillator strength gain material enable lasing threshold energies as low as 3 nJ, achieved by free-space excitation in the quasistationary pumping regime. Lasing wavelengths are detected in the visible wavelength region around 600 nm. Finite element simulations indicate that lasing occurs in fundamental TE/TM cavity modes, as these modes have - in comparison to higher order cavity modes - the smallest mode volume and the largest overlap with the gain material. In addition, we investigate the effect of dye concentration on lasing wavelength and threshold by comparing samples with four different concentrations of rhodamine 6G. Observations are explained by modifying the standard dye laser model.
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    Volume7913
    PublisherSPIE - International Society for Optical Engineering
    Publication date2011
    DOIs
    Publication statusPublished - 2011
    EventLaser Resonators and Beam Control - San Francisco, California, USA
    Duration: 1 Jan 2011 → …
    Conference number: 8

    Conference

    ConferenceLaser Resonators and Beam Control
    Number8
    CitySan Francisco, California, USA
    Period01/01/2011 → …
    SeriesProceedings of SPIE, the International Society for Optical Engineering
    Volume7913
    ISSN0277-786X

    Keywords

    • Finite element analysis
    • Whispering gallery mode
    • Laser
    • Polymer microcavity
    • High-Q, dye

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