Berlin 2005 – wissenschaftliches Programm
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.65: Poster
Montag, 7. März 2005, 18:00–20:00, Poster TU A
Gain switching as lasing mechanism in organic microcavities — •M. Koschorreck, R. Gehlhaar, V. G. Lyssenko, M. Hoffmann, and K. Leo — Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany, www.iapp.de
We report on the dynamic processes in the organic laser host-guest composite of tris-(8-hydroxy quinoline) aluminium (Alq3) and 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H- pyran (DCM) embedded in a double distributed Bragg reflector microcavity, which builds an organic vertical cavity surface emitting laser. Lasing action was observed at a threshold of 0.4 nJ corresponding to 20 µ J cm−2 with a line-width of 0.05 nm (resolution limit). Using a sub-picosecond up-conversion technique we get a comprehensive insight into the dynamics of the build-up of LASER emission. We observed a nonlinearly intensity dependent delay of the emitted radiation burst and a step-like threshold behavior, known from the gain switching mechanism. All experimental results were successfully modeled by a set of coupled rate equations and gave a complete picture of the dynamic processes.