Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) is a laser crystal with the best comprehensive performance and is widely used in industrial, medical, military and scientific research. Nd:YAG is often used in near/far infrared solid-state lasers and its multipliers, triple frequency lasers, It can also be used in diode-pumped all-solid-state micro-miniature lasers, and obtain high quality continuous laser output of red, green and blue.