Improving thermal stability of LiNbO 3  based electro‐optical electric field sensor by depositing a TiO 2  film | Zendy

Wang She | Zendy; Wang Hai | Zendy; Li Chanxiao | Zendy; Zhuang Chijie | Zendy; Zeng Rong | Zendy

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Improving thermal stability of LiNbO 3 based electro‐optical electric field sensor by depositing a TiO 2 film

Author(s) -

Wang She,

Wang Hai,

Li Chanxiao,

Zhuang Chijie,

Zeng Rong

Publication year - 2022

Publication title -

high voltage

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.732

H-Index - 20

ISSN - 2397-7264

DOI - 10.1049/hve2.12198

Subject(s) - electric field , thermal stability , materials science , thermal , optoelectronics , stability (learning theory) , field (mathematics) , engineering physics , chemical engineering , computer science , physics , engineering , thermodynamics , mathematics , quantum mechanics , machine learning , pure mathematics

Electro‐optic electric field sensors based on LiNbO 3 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 LiNbO 3 . An athermal electro‐optic electric field sensor was demonstrated by coating a thin layer of TiO 2 film which has a negative thermo‐optic coefficient, on the common‐path interferometer based sensor to compensate LiNbO 3 '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 TiO 2 film has a much smaller temperature dependence of 0.011°/°C compared to the initial value of 0.1°/°C.

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