Abstract
The linear electrooptic r51 coefficient of tetragonal K0.95Li0.05Ta0.40Nb0.60O3 single crystal was measured and reported. A modified AC modulating method coupled with high precision sample positioner, coherent light source, and phase-locked signal detection, was used to measure the electric field induced rotation of optical axis. The electrooptic r51 coefficient was found to be exceptionally large, r51 = (1.10 ± 0.14) × 104 pm/V at room temperature. Altogether with high ferroelectric phase transition temperature (~440 K), good optical crystal quality, ultrahigh linear electrooptic r51 coefficient and low frequency dependency, the K0.95Li0.05Ta0.40Nb0.60O3 single crystal offers significant application potential for various electrooptic devices.
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