Crystal growth by the heat exchanger method, spectroscopic characterization and laser operation of high-purity Yb:Lu2O3

Yb-doped Lu2O3 crystals of very high optical quality have been grown by the heat exchanger method from a Re-crucible using high-purity raw materials and an improved crystal growth technique. The composition of the grown crystals has been determined by microprobe analysis. The fluorescence lifetime,...

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Bibliographic Details
Published in:Journal of crystal growth 2008-04, Vol.310 (7-9), p.1934-1938
Main Authors: Peters, Rigo, Kränkel, Christian, Petermann, Klaus, Huber, Günter
Format: Article
Language:English
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Summary:Yb-doped Lu2O3 crystals of very high optical quality have been grown by the heat exchanger method from a Re-crucible using high-purity raw materials and an improved crystal growth technique. The composition of the grown crystals has been determined by microprobe analysis. The fluorescence lifetime, measured by the pinhole method, revealed no concentration quenching up the maximum grown doping concentration of 10 at%. Laser operation of these high-purity samples was studied in a nearly concentric resonator under Ti:sapphire pumping. Compared to previous results the cw laser efficiency of Yb:Lu2O3 could be increased considerably to a maximum slope efficiency of etas=86% and 76% at a laser wavelength of 1034 and 1080 nm, respectively.
ISSN:0022-0248
DOI:10.1016/j.jcrysgro.2007.10.078