Bonn 2000 – scientific programme
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Q: Quantenoptik
Q 40: Poster: Festkörperlaser
Q 40.9: Poster
Thursday, April 6, 2000, 16:30–19:30, Aula
Efficiency and band width optimization of high power Yb3+:glass laser amplifiers – a simulation — •Maximilian Darscht, Juri Miklyaev, Thomas Töpfer, Joachim Hein, and Roland Sauerbrey — Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany
Chirped Pulses propagating through high-power regenerative amplifiers experience a shift in frequency because of variation of the gain profile due to absorption and gain narrowing. Both effects can be minimized utilizing an appropriately designed spectral filter at cost of overall efficiency. For simulation of these effects a suitable model has to be applied. The model accounts for pump and signal saturation, the signal absorption in the active medium, cavity losses, finite fluorescence time, and material surface damage. As an example we have simulated a regenerative Yb3+:glass amplifier longitudinally pumped by two laser diodes. It was optimized for maximum bandwidth at fixed extraction efficiency by varying filter design and pump distribution. Maximum bandwidth of 24 nm and extraction efficiency of 21 % were found to be best trade-off.