Berlin 2001 – scientific programme
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Q: Quantenoptik
Q 31: Poster: Laser
Q 31.4: Poster
Friday, April 6, 2001, 12:30–15:00, AT2
Thermal lens and birefringence in end-pumped Yb:fluoride- phosphate-laser-glass — •Stefano Paoloni1, Joachim Hein1, Thomas Töpfer1, Heinz-Günter Walther1, Doris Ehrt2, and Roland Sauerbrey1 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany — 2Otto-Schott-Institut für Glaschemie, Friedrich-Schiller-Universität Jena, Fraunhoferstr. 6, D-07743 Jena, Germany
Yb-doped fluoride phosphate glasses are attractive laser materials for diode-pumped high-power amplifiers due to their large saturation fluence, long fluorescence lifetime as well as broad absorption and emission bands. In order to minimize the impact of thermal distortions on amplifier performance we studied the thermal behavior of a laser-diode end-pumped glass in an L-folded cavity. The observed effects were identified as a superposition of the thermo-optic and the thermo-elastic refractive index change, surface deformation, and induced birefringence. Dependence on pump power and stimulated radiation cooling was investigated. Predictions of a numerical model solving the 3-dimensional non-stationary heat equation were compared to experimental results.