Abstract
Lasing quality 8 at.% Yb:Lu2O3 laser ceramics were fabricated using nanocrystalline Yb:Lu2O3 powders synthesized with a modified coprecipitation method and either (NH4)2SO4 or PAA (Poly acrylic acid) as a dispersant. Although using (NH4)2SO4 as a dispersant the calcinated Yb:Lu2O3 powders could have better sinterability, and the sintered Yb:Lu2O3 ceramics could even have higher in-line transmittance, it was found that the laser ceramics always had much lower lasing efficiency than those fabricated with PAA as a dispersant. We show that the efficiency degradation of the laser ceramics is due to the photodarkening caused by using (NH4)2SO4 as a dispersant.
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