Abstract
Transparent Ho:YAG ceramics were successfully fabricated from commercial γ-Al2O3, Ho2O3 and Y2O3 powders by the solid-state reactive sintering method. The powders were mixed in ethanol with 0.5wt.% tetraethyl orthosilicate (TEOS) added as a sintering aid. The milled slurry was dried and pressed, then sintered from 1650 to 1750°C for up to 20h for all Ho3+ levels studied (0.3–2.5at.%). The densification, microstructure evolution, and optical properties of Ho:YAG ceramics were investigated. Specimens sintered at 1700°C for 12h were fully dense with an over 80% transmittance in the visible region. The grain boundary was clean and no secondary phase was observed.
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