Spectroscopic investigations of thulium doped YAG and YAP crystals between 77 K and 300 K for short-wavelength infrared lasers

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 800 nm, and the absorption and emission cross sections for the tran...

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Published inJournal of luminescence Vol. 202; pp. 427 - 437
Main Authors Körner, Jörg, Lühder, Tilman, Reiter, Jürgen, Uschmann, Ingo, Marschner, Heike, Jambunathan, Venkatesan, Lucianetti, Antonio, Mocek, Tomáš, Hein, Joachim, Kaluza, Malte C.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2018
Subjects
Cross section
Cryogenic cooling
Fluorescence lifetime
Short-wavelength infrared lasers
Spectra
Thulium
YAG
YALO
YAP
Thulium
YALO
Cross section
Cryogenic cooling
YAP
Spectra
Fluorescence lifetime
Short-wavelength infrared lasers
YAG
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ISSN0022-2313
1872-7883
DOI10.1016/j.jlumin.2018.05.070

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Summary: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 800 nm, 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 80 K to 300 K. Furthermore, re-absorption free fluorescence lifetimes of the F43 to H63 transition at 77 K, 200 K and 295 K were obtained using the pinhole method. We observed a significant enhancement of the fluorescence lifetime when cooling from room temperature to 77 K. The lifetime was increased from 9.42 ms to 15.22 ms in Tm:YAG and from 3.81 ms to 4.93 ms 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.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2018.05.070