We present the performance of a laser prototype based on 1% at. Yb : Lu2O3 ceramic, longitudinally pumped in quasi-CW regime\r\nat 968 nm. A slope efficiency of 49% with respect to the absorbed pump power was obtained for laser operation at 1032.5 nm.We\r\nstudied the effects on the laser oscillation due to the reinjection of the residual pump. The thermal behavior of the sample was\r\ninvestigated by means of numerical simulations, accounting for the different thermal load resulting from spontaneous and laser\r\nemission. Finally, we report the measured level of the Amplified Spontaneous Emission, which is found to be less than 0.1mW.
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