Abstract
Transparent Nd:YAG ceramics were fabricated by solid-state reactive sintering, a mixture of commercial Al2O3, Y2O3, and Nd2O3 powders, and their microstructure and optical properties were investigated. A fully dense 1.0at. % Nd:YAG ceramic with an average grain size of ∼15μm was obtained by vacuum sintering at 1750°C for 50h. The optical in-line transmittance of the corresponding sample was very close to that of single crystal. Diode-side-pumped laser operation with two ceramic rods (Ø6×100mm2) was demonstrated. When the pump power was 2000W, the output power of 509W at 1123nm for Nd:YAG ceramic laser was obtained, and the optical-to-optical conversion efficiency was 25.5%. 509W is the highest laser output power for an Nd:YAG laser (including ceramic and single crystal) operating at 1123nm to date.
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