Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.69: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Spectroscopic Properties of Sm3+-doped and Tb3+-doped SrAl12O19 — •Daniel-Timo Marzahl1, Philip Werner Metz1, Benedikt Stumpf1, Fabian Reichert2, Christian Kränkel1,3, and Günter Huber1,3 — 1Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany — 3The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
The hexaaluminate SrAl12O19 (SRA) offers excellent thermo-mechanical properties, low phonon energies, a large band gap, and a high thermal conductivity. These properties make rare-earth doped SRA interesting as a gain material for visible lasers. Such lasers may find application in medicine, biophotonics, and spectroscopy.
SRA exhibits a low crystal field depression. Hence the energetic position of the 5d bands remains high. Energetically lower lying 5d bands could cause excited state absorption, which may prevent laser operation.
In our laboratory Sm3+-doped and Tb3+-doped SRA crystals were grown by the Czochralski technique. In this contribution we report on their spectroscopic properties and discuss the potential as active gain media for visible solid state lasers. The spin forbidden transitions of Sm3+ and Tb3+ exhibit the highest cross sections in the visible spectral range at 593 nm and 542 nm, respectively, with values in the order of 10−21 cm2.