München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 9: Festkörper- und Halbleiterlaser
Q 9.1: Talk
Monday, March 22, 2004, 16:30–16:45, HS 218
Photo-Physical and Lasing Characterisation of Neat Films of a Thianthren-Phenyl-Vinylene-Paraphenylene Dye — •Alfons Penzkofer1, Wolfgang Holzer1, Hans-Heinrich Hörhold2, and ernst-Eberhard Kley3 — 1Institut II -Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053 Regensburg — 2Institut für Organische Chemie und Makromolekulare Chemie der Universität Jena, Humboldtstrasse 10, 07743 Jena — 3Institut für Angewandte Physik, Friedrich-Schiller Universität Jena, Max-Wien Platz 1, 07743 Jena
Wave-guided travelling-wave laser action and distributed-feedback laser action in neat thin films of a thianthrene-phenyl-vinylene-paraphenylene (TPVPP) dye on glass substrates and corrugated gratings have been achieved by optical excitation with picosecond laser pulses (wavelength 347.15 nm, duration 30 ps). The dye is a model compound of paraphenylenevinylene polymers. The travelling-wave laser emits at 544 nm. The threshold pump pulse energy is about 60 nJ. The distributed-feedback laser is wavelength tunable in the range from 520 nm to 580 nm by variation of the groove spacing and the film thickness. The refractive index and absorption cross-section spectra of the films are determined by reflectance and transmission measurements. The fluorescence behaviour of TPVPP neat films and TPVPP solutions was analysed. A fluorescence quantum yield of about 0.6 is found for both TPVPP neat films and TPVPP in 1,4-dioxane.