Measurement of temperature-dependent absorption and emission spectra of Yb:YAG, Yb:LuAG, and Yb:CaF2 between 20 °C and 200 °C and predictions on their influence on laser performance (original) (raw)

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Joerg Koerner, Christian Vorholt, Hartmut Liebetrau, Martin Kahle, Diethard Kloepfel, Reinhard Seifert, Joachim Hein, and Malte C. Kaluza

Author Affiliations

Joerg Koerner,1,5Christian Vorholt,3,4Hartmut Liebetrau,1Martin Kahle,1,2Diethard Kloepfel,1Reinhard Seifert,1,2Joachim Hein,1,2and Malte C. Kaluza1,2

1Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany

2Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany

3Labor für Photonik, Fachhochschule Muenster, Stegerwaldstraße 39, 48565 Steinfurt, Germany

4e-mail: cvorholt@fh-muenster.de

5e-mail: joerg.koerner@uni-jena.de

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Abstract

Accurate values of the emission and absorption cross sections of Yb:YAG, Yb:LuAG, and Yb:CaF2 as a function of temperature between room temperature and 200 °C are presented. For this purpose, absorption and fluorescence spectra were measured using a setup optimized to reduce the effect of radiation trapping. From these data, emission cross sections were retrieved by combining the Fuchtbauer–Ladenburg equation and the reciprocity method. Based on our measurements, simple estimations illustrate the effect of temperature shifts that are likely to occur in typical laser setups. Our results show that even minor temperature variations can have significant impact on the laser performance using Yb:YAG and Yb:LuAG as an active medium, while Yb:CaF2 appears to be rather insensitive.

© 2012 Optical Society of America

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