Linear Electro-Optic Effect in Ferroelectric KTN
Linear Electro-Optic Effect in Ferroelectric KTN
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DOI：
10.1364/josa.57.000671
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发表时间：
1967-05
影响因子：
--
通讯作者：
J. V. Raalte
中科院分区：
文献类型：
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作者：
J. V. Raalte
在铁电体KTN（KTax Nb 1 − xO 3）中测量了低频线性电光系数随温度的变化。场致延迟的测量结果表明，半波电压约为KDP的1/100，约为BaTiO 3的1/2。半波电压从低于居里点3°C时的约20 V增加到低于居里点40°C时的约115 V。因此，通过改变Ta与Nb的比率来定制居里点的可能性使得KTN对于光调制和偏转具有吸引力。该系数非常大，显示出预期的朝向正交转变温度的增加，但它对于调制或偏转是无用的。
The low-frequency linear electro-optic coefficients have been measured in ferroelectric KTN (KTax Nb1−xO3) as a function of temperature. A measurement of the field-induced retardation shows that the half-wave voltage is about one 100th of that for KDP and about one half that for BaTiO3. The half-wave voltage increases from about 20 V at 3°C below the Curie point to approximately 115 V at 40°C below the Curie point. The possibility of tailoring the Curie point by varying the Ta-to-Nb ratio therefore makes KTN attractive for light modulation and deflection.An ac technique was developed to determine the electro-optic coefficient r42. This coefficient is extremely large, showing the expected increase towards the orthorhombic transition temperature but it is not useful for modulation or deflection.