Abstract
Highly doped Er<sup>3+</sup>:GdTaO<sub>4</sub> crystal was grown successfully by the Czochralski(CZ) method for the first time. The crystal structure was determined by Rietveld refinement to X-ray powder diffraction. The absorption and photoluminescence spectra at room temperature were investigated. The Judd-Ofelt transition intensity parameters Ω<sub>t</sub> (t=2, 4, 6) were fitted to its absorption spectrum. With parameters Ω<sub>t</sub>, the oscillator strengths, fluorescence branching ratios, transition probabilities and the lifetimes of Er3+:GdTaO4 were calculated. The near-infrared and mid-infrared fluorescence properties were also analyzed and discussed. The results show that the Er<sup>3+</sup>:GdTaO<sub>4</sub> crystal may be regarded as a potential solid-state laser material for 2.6μm.
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