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Proceedings Paper

Lasing in dye-doped high-Q conical polymeric microcavities
Author(s): 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
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Paper 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.

Paper Details

Date Published: 21 February 2011
PDF: 7 pages
Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79130Y (21 February 2011); doi: 10.1117/12.874808
Show Author Affiliations
Tobias Grossmann, Karlsruher Institut für Technologie (Germany)
Simone Schleede, Karlsruher Institut für Technologie (Germany)
Mario Hauser, Karlsruher Institut für Technologie (Germany)
Mads Brøkner Christiansen, Technical Univ. of Denmark (Denmark)
Christoph Vannahme, Karlsruher Institut für Technologie (Germany)
Carsten Eschenbaum, Karlsruher Institut für Technologie (Germany)
Sönke Klinkhammer, Karlsruher Institut für Technologie (Germany)
Torsten Beck, Karlsruher Institut für Technologie (Germany)
Jochen Fuchs, Karlsruher Institut für Technologie (Germany)
G. Ulrich Nienhaus, Karlsruher Institut für Technologie (Germany)
Uli Lemmer, Karlsruher Institut für Technologie (Germany)
Anders Kristensen, Technical Univ. of Denmark (Denmark)
Timo Mappes, Karlsruher Institut für Technologie (Germany)
Heinz Kalt, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 7913:
Laser Resonators and Beam Control XIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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