Temperature dependent spectroscopic study of Yb<sup>3+</sup>-doped KG(WO<sub>4</sub>)<sub>2</sub>, KY(WO<sub>4</sub>)<sub>2</sub>, YAlO<sub>3</sub> and YLiF<sub>4</sub> for laser applications
Jörg Körner, Mathias Krüger, Jürgen Reiter, Andreas Münzer, Joachim Hein, Malte C. Kaluza
Abstract
We present a study on temperature dependent spectroscopic data for Yb:KGW, Yb:KYW and Yb:YLF between 80 K and 280 K and Yb:YAP between 100 K and 300 K. Absorption and emission cross sections are determined. The latter ones are obtained by using a combination of the McCumber relation and the Füchtbauer-Ladenburg equation. Fluorescence lifetimes are measured within a setup optimized for the suppression of re-absorption and compared to the radiative lifetimes calculated from the previously determined cross sections to cross check the validity of the measurements. The cross sections are evaluated with regard to the materials’ potential for supporting the generation of ultra-short laser pulses, low quantum defect lasing and requirements for suitable diode laser pump sources.