Low-frequency–dependent electro-optic properties of potassium lithium tantalate niobate single crystals
1 Department of Physics, Harbin Institute of Technology - Harbin 150001, PRC
2 Multifunctional Electronic Materials and Device Research Lab, Department of Electrical and Computer Engineering, The University of Texas at San Antonio - San Antonio, TX 78249, USA
Received: 2 March 2013
Accepted: 15 April 2013
A series of lead-free ferroelectric potassium lithium tantalate niobate K0.95Li0.05Ta1−xNbxO3 (x = 0.78, 0.69, 0.60, 0.52) single crystals were grown using the top-seeded melt growth method. The low-frequency–dependent linear electro-optic properties of K0.95Li0.05Ta1−xNbxO3 single crystals in the tetragonal state were investigated using the Senarmont method, autoscanning Mach-Zehnder interferometer technique and AC measurement method at room temperature. The electro-optic measurements were taken with continuous low frequency (from 1 kHz to 100 kHz) of a sinusoidal electric field, and large electro-optic responses were observed. For every component, the values of the electro-optic coefficients γ33, γ13 and γc decrease with the increase of frequency. However, the γ51 shows low sensitivity to the change of frequency. γ33, γ13 and γc increase with tantalum content, but γ51 decreases with the increase of tantalum content. The electro-optic properties of high-optical-quality K0.95Li0.05Ta1−xNbxO3 single crystals forecast their outstanding potential in various electro-optic applications.
PACS: 78.20.Jq – Electro-optical effects / 42.70.-a – Optical materials / 77.22.-d – Dielectric properties of solids and liquids
© EPLA, 2013