中文摘要：

通过将三元体系单斜相结构弛豫铁电单晶铌铟镁酸铅–钛酸铅[Pb（In1/2Nb1/2）O3–Pb（Mg1/3Nb2/3）O3–Pb Ti O3（PIN–PMN–PT）]的准同型相界组分0.24PIN–0.43PMN–0.33PT单晶沿[011]c方向极化成准单畴态,研究了该单晶的电光性能。采用改进的Mach-Zehnder干涉系统,选用波长为632.8nm激光对单晶的电光系数张量γ13、γ23和γ33进行测量及分析。根据实验及计算结果,排除由压电效应引起晶体在通光方向的伸缩,电光系数张量γ13=–21.8 pm/V,γ23=64.7 pm/V,γ33=85.8 pm/V。测试结果表明,单晶的电光系数具有较高的γ23和γ33分量,在实际的电光器件应用中,可以在保证单晶透过率的情况下对这两个分量进行利用。

英文摘要：

The linear electro-optic properties of relaxor ferroelectric crystal 0.24PIN–0.43PMN–0.33 PT in the monoclinic phase poled along the [011]c direction were investigated at room temperature using the 632.8 nm He-Ne laser. The linear electro-optic coefficients（i.e., γ13= –21.8 pm/V, γ23=64.7 pm/V, and γ33=85.8 pm/V） were determined by a modified Mach-Zehnder interferometer method. The effective electro-optic coefficient（i.e., γc=107.6 pm/V） was also calculated. The experimental result shows that the [011]c poled single crystal has the higher electro-optic coefficients（i.e., γ23 and γ33）, which can be used in the actual electro-optical device applications under the condition of excellent light transmittance.