HIGHLY EFFICIENT 2ND-HARMONIC GENERATION OF ND-YAG LASER-RADIATION USING MGO-DOPED LINBO3

Noncritically phase-matched second harmonic generation (SHG) of 532-nm radition from 1064-nm in MgO-doped LiNbO3 has been investigated by us ing Q-switched Nd:YAG laser. SHG conversion efficiencies were typicall y achieved as high as 50% with 2 mol% MgO-doped LiNbO3 at the warm pha se-matching temperature. No photorefractive damage were found fur more than a-hour operation of SHG under fundamental power density of 32 MW /cm(2). The thermo-birefringence coefficient and the electro birefring ence coefficient of SHG were calculated from the temperature phase-mat ching profile with the electric field.