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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?13、?23和?33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?13=–21.8 pm/V,?23=64.7 pm/V,?33=85.8 pm/V。测试结果表明,单晶的电光系数具有较高的?23和?33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。
The structure of the ternary system monoclinic phase relaxation ferroelectric single crystal niobium indium magnesium lead-lead titanate [Pb (In1 / 2Nb1 / 2) O3-Pb (Mg1 / 3Nb2 / 3) O3-Pb Ti O3 -PMN-PT)], the polarization of the 0.24PIN-0.43PMN-0.33PT single crystal along the [011] c direction was aligned into a quasi-single domain, and the electro-optic properties of the single crystal were investigated. An improved Mach-Zehnder interferometer system was used to measure and analyze the electro-optic coefficient tensor? 13,? 23 and? 33 of a single crystal with a wavelength of 632.8 nm. According to the experiment and calculation results, the expansion and contraction of the crystal caused by the piezoelectric effect in the light passing direction are excluded. The electro-optic coefficient tensor? 13 = -21.8 pm / V,? 23 = 64.7 pm / V,? 33 = 85.8 pm / V. The test results show that the single-crystal electro-optic coefficient has a higher 23 and 33 components, in the actual application of the electro-optical device, can ensure the single crystal transmittance of the case of these two components.