Fabrication and Properties of Er∶Lu2O3 Transparent Ceramics with Different Doping Concentrations
Er∶Lu2 O3 transparent ceramics are one of the candidate solid-state gain media for high efficiency and high power laser in the near and mid-infrared bands due to the advantages of high thermal conductivity,high thermal shock resistance,good spectral properties and low preparation temperature.Exploring the influence of Er3+doping concentration(atomic number fraction)on the preparation and properties of Er∶Lu2 O3 transparent ceramics for the related laser application is crucial for achieving high-quality Er∶Lu2O3 ceramics.In this paper,Er∶Lu2O3 transparent ceramics were fabricated using vacuum pre-sintering combined with hot isostatic pressing(HIP)post-treatment from the nano-powders synthesized by the coprecipitation method.The results show that the phases of all Er∶Lu2O3 nano-powders calcined at 1 100℃with different Er3+concentrations are almost consistent with that of the pure cubic Lu2O3 and the 10％Er∶Lu2O3 nano-powder shows better dispersibility.The average grain sizes of 0.3％and 10％Er∶Lu2O3 ceramics pre-sintered at 1 500 ℃ are 0.86 and 0.87 μm with the relative densities of 95.1％and 96.2％,respectively.The corresponding pre-sintered ceramics were HIP-ed at 1 750 ℃ show the in-line transmittance of 71.6％and 78.0％(thickness 2.9 mm)at 2 400 nm,respectively.Especially,the in-line transmittance of the 0.3％Er∶Lu2O3 ceramics sharply decreases in the short wave range due to the numerous remained residual pores.The absorption and emission spectra of 0.3％and 10％Er∶Lu2O3 transparent ceramics were calculated.0.3％Er∶Lu2O3 ceramics possesses higher absorption and emission cross-sections around the band centered at 1.55 μm.
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