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Proceedings Article

Lasing in dye-doped high-Q conical polymeric microcavities

[+] Author Affiliations
Tobias Grossmann, Simone Schleede, Mario Hauser, Christoph Vannahme, Carsten Eschenbaum, Sönke Klinkhammer, Torsten Beck, Jochen Fuchs, G. Ulrich Nienhaus, Uli Lemmer, Timo Mappes, Heinz Kalt

Karlsruher Institut für Technologie (Germany)

Mads B. Christiansen, Anders Kristensen

Technical Univ. of Denmark (Denmark)

Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79130Y (February 21, 2011); doi:10.1117/12.874808
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From Conference Volume 7913

  • Laser Resonators and Beam Control XIII
  • Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko
  • San Francisco, California, USA | January 22, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Tobias Grossmann ; Simone Schleede ; Mario Hauser ; Mads B. Christiansen ; Christoph Vannahme, et al.
"Lasing in dye-doped high-Q conical polymeric microcavities", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79130Y (February 21, 2011); doi:10.1117/12.874808; http://dx.doi.org/10.1117/12.874808


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