对周期性极化高掺镁铌酸锂倍频过程进行了准相位匹配倍频理论研究。在室温下通过外加电场极化法,用较低的极化开关电场~5.5 kV/mm,在厚为1 mm、长为10 mm、宽为10 mm的掺镁铌酸锂基片上成功地制备了周期为5.8~7.3μm(间隔0.3μm)的一阶准相位匹配倍频周期性极化光学微结构。将温度控制在 70 ℃左右,以波长为1.064μm的Nd∶YAG激光为基频光源,对所研制的光学微结构样品进行倍频通光实验验证。当入射基频光为920 mW时,可以获得约15 mW的532 nm准连续倍频蓝光输出,其归一化转换效率高达1.77 %/W。 The quasi-phase-matching frequency-doubling theory of periodically polarized high-Mg-doped lithium niobate is studied. Successive preparation was achieved at room temperature by applying an electric field polarization method with a lower polarization switching electric field of ~5.5 kV / mm on a magnesium-doped lithium niobate substrate with a thickness of 1 mm, a length of 10 mm and a width of 10 mm The first-order quasi-phase-matching periodic polarization optical microscopy with a period of 5.8 ~ 7.3μm (with an interval of 0.3μm) The temperature controlled at about 70 ℃, the wavelength of 1.064μm Nd: YAG laser as the base frequency light source, the developed optical microstructure samples were frequency doubled experiment. When the incident fundamental frequency is 920 mW, the quasi-continuous frequency doubling blue light output of about 15 mW can be obtained, and the normalized conversion efficiency is as high as 1.77% / W.