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Q: Quantenoptik
Q 40: Poster: Festkörperlaser
Q 40.7: Poster
Thursday, April 6, 2000, 16:30–19:30, Aula
Lasing and thermal properties of Er3+:Yb3+–doped fluoride phosphate glasses — •Jens Philipps1, Thomas Töpfer1, Joachim Hein1, Roland Sauerbrey1, H. Ebendorff-Heidepriem2, and Doris Ehrt2 — 1Institut für Optik und Quantenelektronik, Universität Jena, Max-Wien-Platz 1, 07743 Jena — 2Otto-Schott-Institut für Glaschemie, Universität Jena, Frauenhoferstr. 6, 07743 Jena
media for diode pumped lasers. Several Er3+:Yb3+-doped fluoride phosphate glasses with different phosphate content were examined for their spectroscopic and lasing properties. Absorption and emission spectra of glasses were taken and respective cross sections calculated. Maximum output powers of 120 mW at slope efficiencies of up to 21 % were obtained in a hemispherical resonator configuration. Concentration ratio for best lasing behavior of erbium glasses was found at low Er3+- (5×1019 cm−3) and high Yb3+-content (8×1020 cm−3). Energy transfer between Yb3+- and Er3+-ions was examined by spectrally resolved fluorescence decay measurements, with efficiencies between 78 % and 92 % depending on doping level. Wavelength tuning range was 100 nm with 0.3% output coupling loss. Thermal effects can severely limit performance of laser glasses due to their low thermal conductivity. Pump induced heating of samples was calculated by solving the thermal transport equation. The temperature sensitive ratio of the 2H11/2 to the 4S3/2 green upconversion fluorescence intensity can be used to experimentally verify calculated results. Analysis of the resulting damage by thermal stress and heating is presented.