【摘要】 折射率是光学晶体的基本参数，准确测定晶体的折射率能够为晶体的电光、声光、非线性应用提供基本计算参数和实验参量。为了准确测定Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃（PMN-PT）晶体在可见光和近红外波段的折射率系数，搭建了激光自准直折射率测量系统，对纯铌酸锂晶体的折射率测试结果与现有文献报道误差小于1/1 000,使用该系统对沿<001>极化的Pb(Mg_1/3Nb_2/3)O₃-0.39PbTiO₃（PMN-0.39PT）单畴晶体进行了测定，得到了单畴的PMN-0.39PT晶体在波长分别为594 nm、633 nm、1 150 nm和1 520 nm时的折射率和色散方程，测量结果与现有文献规律性一致。结果表明该方法可用于准确快速测定新型电光晶体折射率。更多还原

【Abstract】 The refractive index is the basic parameter of optical crystal, and the accurate determination of refractive index of crystal can provide basic calculation parameters and experimental parameters for electro-optic, acousto-optic and nonlinear applications of crystal. In order to accurately measure the refractive index coefficient of Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃（PMN-PT） crystal in visible and near-infrared wavelengths, a laser autocollimatiion refractive index measurement system was set up.The error between the refractive index measurement results of pure lithium niobate crystal and the existing literature reports is less than 1/1 000. Using this system, the single-domain Pb(Mg_1/3Nb_2/3)O₃-0.39 PbTiO₃（PMN-0.39 PT） crystals with <001> polarization was measured. The refractive index and dispersion equations of single-domain PMN-0.39 PT crystals at wavelengths of 594 nm, 633 nm, 1 150 nm and 1 520 nm were obtained, and the measurement results are consistent with the regularity of the existing literature. The results show that this method can be used to determine the refractive index of new type electro-optic crystal accurately and quickly.更多还原