Nd:GGG single crystals are known as a prominent active medium in diode-pumped solid-state lasers. Nowadays, they are commonly used in applications of high power lasers. Possibility of growing with flat solid/melt interface and eliminating of many crystal defects are some of the advantages of this crystal. Furthermore, high concentration of doping ion, high absorption coefficient at pumped-wave length of 808nm, large excited-emission cross section as well as high laser efficiency and low laser threshold are other excellent characteristics of this crystal.