Abstract
Highly transparent Tm:YAG ceramic was fabricated by a solid‐state reaction and vacuum sintering. The optical properties, the microstructure, and the laser performance of the Tm:YAG ceramic were investigated. A Tm:YAG ceramic with an average grain size of ∼10 μm was obtained by sintering at 1750°C for 10 h. The in‐line transmittance was 84.0% at 2015 nm. The absorption coefficients at 681 and 785 nm were 8.23 and 3.27 cm−1, respectively. The grain boundaries were clean and no secondary phase was observed. The 6 at.% Tm:YAG ceramic slab (1.2 mm × 5 mm × 6 mm) was end‐pumped by a laser diode at 792 nm, and the maximum output power of 4.5 W was obtained with a slope efficiency of 20.5% at 2015 nm.
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