Nd:MgO:LiNbO₃ is a self-frequency doubling laser crystal, which combines the excellent laser properties of the Nd³⁺ ion with the electro-optical and NLO properties of LiNbO₃. Furthermore, it also remains the advantage of high damage threshold of MgO:LiNbO₃. These permit Nd:MgO:LiNbO₃ crystal to be designed of miniature green lasers and other miniature muti-functional devices, including self-frequency-doubled lasers, self-modulated and self-Q-switch lasers, and waveguide devices.