Journal
OPTICAL MATERIALS EXPRESS
Volume 1, Issue 8, Pages 1447-1456Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.1.001447
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We present spectroscopic investigations and the first laser operation of Ho:Lu2O3. Laser operation was obtained with two different setups at room temperature: In a 1.9 mu m diode pumped setup a maximum output power of 15 W was achieved. With a Tm-fiber laser pumped setup the maximum output power was 5.2 W and the slope efficiency was 54% with respect to the absorbed pump power. Absorption measurements revealed absorption cross sections of up to 11.7 . 10(-21) cm(2) at 1928 nm. In the 2.1 mu m range a maximum emission cross section of 4.5 . 10(-21) cm(2) at 2124 nm was determined, which remains the highest gain peak even for high inversions. The fluorescence lifetime of the I-5(7)-manifold was found to be 10 ms. (C) 2011 Optical Society of America
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