Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7839867 | Journal of Luminescence | 2018 | 11 Pages |
Abstract
We present detailed measurements of laser relevant cross sections of thulium doped yttrium-aluminum-garnet (Tm:YAG) and yttrium-aluminum-perovskite (Tm:YAP), including the absorption cross sections for the H63 to H43 transition near 800ânm, and the absorption and emission cross sections for the transitions between the H63 and F43 manifolds in the short-wavelength infrared region. For Tm:YAP we present data for all polarization axes. The measurements were carried out at temperatures ranging from 80âK to 300âK. Furthermore, re-absorption free fluorescence lifetimes of the F43 to H63 transition at 77âK, 200âK and 295âK were obtained using the pinhole method. We observed a significant enhancement of the fluorescence lifetime when cooling from room temperature to 77âK. The lifetime was increased from 9.42âms to 15.22âms in Tm:YAG and from 3.81âms to 4.93âms in Tm:YAP. This indicates that lifetime quenching is present at room temperature, which can be overcome, at least partially, by cryogenic cooling. These data are presented with the scope to qualify these materials for their use in a new generation of cryogenically cooled, short-wavelength infrared, high-energy class diode pumped solid state lasers utilizing the cross relaxation mechanism for pumping.
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Authors
Jörg Körner, Tilman Lühder, Jürgen Reiter, Ingo Uschmann, Heike Marschner, Venkatesan Jambunathan, Antonio Lucianetti, TomáÅ¡ Mocek, Joachim Hein, Malte C. Kaluza,