Open AccessImproving 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 , materials science , optoelectronics , interferometry , voltage , electro optics , optics , electro optic effect , thin film , lithium niobate , thermal stability , coating , electrical engineering , chemistry , composite material , nanotechnology , physics , organic chemistry , quantum mechanics , engineering
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.