报道了掺铁(Fe)的钽铌酸钾钠(KNTN)晶体的电光及电控衍射性能。利用顶部籽晶助溶剂法生长了高质量的晶体,居里温度为15℃;利用单光束椭偏法测量了晶体的有效二次电光系数Reff,在居里温度附近,Reff高达1.05×10-15 m2/V2,电光调制能力相当于铌酸锂的19倍(利用LiNbO3的γ33=30.8×10-12 m/V,偏压为500V/mm),Reff随着温度的升高而减小。利用二波耦合实验装置测量了晶体的电控衍射性能,当施加在晶体上的电场从0增加到900V/mm时,晶体的衍射效率先增大后减小,并且在外加电场为700V/mm时达到最大值80%。结果表明,Fe:KNTN是一种优异的电光晶体和电控衍射晶体。 The electro-optical and electron diffraction properties of potassium tantalate niobate (KNTN) crystals doped with iron (Fe) were reported. A high-quality crystal was grown by the top-seeded cosolvent method with a Curie temperature of 15 ℃. The effective second-order optical coefficient Reff of the crystal was measured by single-beam ellipsometry. The Reff was as high as 1.05 × 10- 15 m2 / V2. The electro-optic modulation capacity is 19 times that of lithium niobate (γ33 = 30.8 × 10-12 m / V with LiNbO3 and the bias voltage is 500V / mm). Reff decreases with increasing temperature. When the electric field applied to the crystal increases from 0 to 900 V / mm, the diffraction efficiency of the crystal first increases and then decreases, and at an applied electric field of 700 V / mm The maximum is 80%. The results show that Fe: KNTN is an excellent electro-optic crystal and electronically controlled diffraction crystal.