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Highly transparent Lu2O3 ceramics with and without Nd3+ and Eu3+ dopants were fabricated by spark plasma sintering using a two-step pressure profile. A transmittance at 1080nm for the Lu2O3 ceramics sintered by as-received powders at a pressure of 100MPa was 57%. By sintering ball-milled Lu2O3 powders with 0.2mass% LiF at a preloading pressure of 10MPa, final pressure of 100MPa, heating rate of 0.17K s11, and sintering temperature of 1723K, the transmittance at 1080 nm of the Lu2O3 ceramics reached 80­82% after annealing in air, i.e., nearly 100% of the theoretical value for no scattering. Finally, laser oscillation was demonstrated using 1 at.% Nd:Lu2O3 transparent ceramics at 1076 and 1080nm wavelengths, e.g., laser output of 0.2W and slope efficiency of 14% for straight-cavity configuration.

journal of the ceramic society of japan

Laser oscillation and luminescence of Nd&lt;sup&gt;3+&lt;/sup&gt;- and Eu&lt;sup&gt;3+&lt;/sup&gt;-doped Lu&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; transparent ceramics fabricated by spark plasma sintering