Characteristic

Yttrium aluminum garnet (YAG, Y₃Al₅O₁₂) is a synthetic crystalline material of the garnet group. It is a cubic yttrium aluminum oxide phase.

Chemical formula：Y₃Al₅O₁₂

Molar mass： 593.618 g/mol

Appearance： colourless crystals

Density： 4.88 g/cm3

Melting point： 1870°C 

dielectric constant：16-20

Application

YAG, like garnet and sapphire, has no uses as a laser medium when pure. However, after being doped with an appropriate ion, YAG is commonly used as a host material in various solid-state lasers. Rare earth elements such as neodymium and erbium can be doped into YAG as active laser ions, yielding Nd:YAG and Er:YAG lasers, respectively. Cerium-doped YAG (Ce:YAG) is used as a phosphor in cathode ray tubes and white light-emitting diodes, and as a scintillator.