Abstract
2.0μm emission properties of Ho<sup>3+</sup>-Yb<sup>3+</sup> co-doped tellurite oxy-halide glass exited by 980nm LD is reported. Mid-infrared transmittance property of glass was investigated by Fouriertransform infrared (FTIR) spectrometer. The Judd-Ofelt intensity parameters Ω<sub>t</sub>)<i>t=2,4,6)</i> , spontaneous radiative transition probabilities, branching ratios and radiative lifetime of Ho3+ were calculated according to the absorption spectra by using Judd-Ofelt theory. The absorption, emission cross-sections and gain coefficient of Ho<sup>3+</sup>:<sup>5</sup>I<sub>7</sub>→<sup>5</sup>I<sub>8</sub> are calculated based on the McCumber and Reciprocity theories. Results indicate that the maximum 2.0μm emission intensity of Ho<sup>3+</sup> was achieved at 0.15mol% Ho<sub>2</sub>O<sub>3</sub> and 1.5mol% Yb2O3 concentrations in tellurite oxy-halide glass. The maximum absorption and stimulated emission cross-section of Ho<sup>3+</sup> near 1944nm are 6.37 x 10<sup>-21</sup>0cm<sup>2</sup> at 2.0μm and 10.94 x 10<sup>-21</sup>cm<sup>2</sup> respectively. The results suggest Ho<sup>3+</sup>-Yb<sup>3+</sup> co-doped tellurite oxy-halide glass is a good candidate for efficient 2.0μm laser.
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