掺Fe的钽铌酸钾钠晶体的电光及电控衍射性能

Electro-Optic Property and Voltage-Controlled Diffractive Property of Fe-Doped Potassium Sodium Tantalate Niobate Crystal

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。

Electro-optic and voltage-controlled diffractive properties of Fe-doped potassium sodium tantalate niobate （Fe：KNTN） crystal are presented. This crystal is grown by the top seeded solution growth （TSSG） method and the Curie temperature is 15 ~C. Effective quadratic electro-optic （QEO） coefficient Roof is measured with the one-beam ellipsometric setup, and its Rotf achieves as high as 1.05 ）〈 10 is m2/V2 near the Curie temperature which is about 19 times that of LiNbO~ under an electric field of 500 V/mm. Roff declines with the increasing temperature. The voltage-controlled diffractive property is measured by a two-wave mixing setup. When the external electric field increases from 0 to 900 V/mm, the diffraction efficiency increases firstly and decreases afterward, and reaches the maximum value of 80 % at 700 V/ram. These results show that Fe：KNTN is a promising electro-optic crystal and voltage-controlled diffractive crystal.