Electro-optic electric field sensors based on LiNbO₃ are widely used for the measurement of electric fields or transient voltages. However, the working bias of the sensor is influenced by the temperature due to the thermo-optic effect of LiNbO₃. An athermal electro-optic electric field sensor was demonstrated by coating a thin layer of TiO₂ film which has a negative thermo-optic coefficient, on the common-path interferometer based sensor to compensate LiNbO₃'s positive thermo-optic coefficient. Both calculation and experimental studies were conducted. The experimental results reasonably agree well with the calculated values, and the results show the sensor coated with a 640 nm thick TiO₂ film has a much smaller temperature dependence of 0.011°/°C compared to the initial value of 0.1°/°C.

中文翻译：

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通过沉积 TiO2 薄膜提高基于 LiNbO3 的电光电场传感器的热稳定性

_{基于 LiNbO 3}的电光电场传感器广泛用于测量电场或瞬态电压。_{然而，由于LiNbO 3}的热光效应，传感器的工作偏差会受到温度的影响。通过在基于共路干涉仪的传感器上涂覆一层具有负热光系数的TiO ₂薄膜来补偿LiNbO ₃的正热光系数，展示了一种无热电光电场传感器。进行了计算和实验研究。实验结果与计算值相当吻合，结果表明传感器涂有 640 nm 厚的 TiO ₂与 0.1°/°C 的初始值相比，薄膜的温度依赖性要小得多，为 0.011°/°C。