Yttrium aluminium garnet (YAG, Y3Al5O12) is a synthetic crystalline material of the garnet group. It is a cubic yttrium aluminium oxide phase, with other examples being YAlO3 in a hexagonal or an orthorhombic, perovskite-like form, and the monoclinic Y4Al2O9.
YAG 069 (OTTO) Yttrium aluminium garnet single crystals, <100>, 10 mm x 10 mm x 0.5 mm, 99.99% - used as a host material in various solid-state lasers