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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.73: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Low-threshold conical microcavity dye lasers — •Saskia Becker1, Tobias Grossmann1,2, Mario Hauser1, Dominik Floess1, Torsten Beck1, Timo Mappes2, and Heinz Kalt1 — 1Institut für Angewandte Physik, Karlsruhe Institute of Technology (KIT),76128 Karlsruhe, Germany — 2Institut für Mikrostrukturtechnik, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
We report on utilizing high-Q polymeric conical microresonators for the development of low-threshold lasers operating in the visible spectral region. This type of laser is promising for the development of highly integrated photonic circuits or lab-on-chip systems.
The microcavities are made of low loss, thermoplastic polymer poly(methyl methacrylate) (PMMA), directly processed on a silicon substrate and possess cavity Q factors above two million in the 1300 nm wavelength region. By integrating a large oscillator strength gain material, e.g. the dye molecule rhodamine 6G, into the polymeric host matrix, laser thresholds as low as 3 nJ per pulse are observed under quasi-stationary pumping conditions. By varying the dye concentration, laser emission wavelengths can be spectrally tuned. This effect can be explained using a standard model of a dye lasing in a Fabry-Perot cavity.