Temperature influence on the voltage-controlled diffractive property of Mn-doped potassium sodium tantalate niobate crystal

• High quality paraelectric Mn0.01:K0.94Na0.05Ta0.58Nb0.42O3 single crystal was grown.
• Quadratic electro-optic coefficient R11 reaches 3.50 × 10−15 V2 m−2 near TC.
• Adjust TC of the crystal to the work point can obtain high performance device.

We report the temperature influence on the voltage-controlled diffractive property of Mn-doped potassium sodium tantalate niobate crystal. The crystal was grown by the top seeded solution growth method. Its quadratic electro-optic coefficients achieved as high as R11 = 3.50 × 10−15 m2/V2 and R12 = −0.44 × 10−15 m2/V2 near the Curie temperature, while they declined with the increasing temperature. The external electric field which correspond to the maximum diffraction efficiency of photorefractive grating moved from 166 V/mm to 512 V/mm as the temperature increased from 25 °C to 32.5 °C. The maximum diffraction efficiencies all reached the maximum value of 60% at different temperatures. The results were discussed and compared with the theoretical equations.