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Q: Fachverband Quantenoptik und Photonik
Q 35: Laser Development and Applications (Spectroscopy)
Q 35.4: Talk
Wednesday, March 8, 2017, 15:15–15:30, P 5
Dy3+:Lu2O3 as a promising gain material for mid-infrared lasers — •Alexander M. Heuer1,2, Patrick von Brunn1,2, and Christian Kränkel1,2 — 1Institut für Laser-Physik, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging
The cubic sesquioxide Lu2O3 is a suitable host material for mid-infrared laser applications due to its high thermal conductivity and low phonon energy. We report on the first growth from the melt and spectroscopic analysis of monocrystalline Dy3+:Lu2O3 in the mid-infrared spectral range. Absorption and emission cross-sections in the wavelength range between 2 µm and 3.8 µm were determined. Gain cross-sections in the same wavelength region were derived and point towards possible laser action at 3256 nm and 3388 nm. The most suitable pump wavelengths for in-band pumping directly into the emitting multiplet were found to be 2713 nm and 2776 nm. This allows for pumping by an erbium-based mid-infrared laser. From the emission cross-sections the lifetime of the emitting 6H13/2 multiplet has been calculated to be in the order of 20 ms. Corresponding measurements are in progress. Compared to the values reported for the mid-infrared laser material Dy:ZBLAN the cross-sections of Dy3+ in Lu2O3 are about 50 % higher. This reveals that Dy3+:Lu2O3 is a promising candidate for the first mid-infrared oxide host material based on the Dy3+-ion.