Abstract
We present measurement of such absorption and emission cross sections in an temperature range from 100K to room temperature for various gain material such as Yb:YAG, Yb:CaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and Yb:FP15-glass. The absorption cross sections are calculated from the absorption spectra. The emission cross sections are determined from the absorption and emission spectra employing the Fiichtbauer-Ladenburg method and the McCumber relation. Additional wavelength dependent gain measurements are used to cross check the validity of the measurements.
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