Wang Yongguang, Wang Guochen, Gao Wei, Zhao Yuxin
Opt Express. 2023 Jul 31;31(16):27054-27068. doi: 10.1364/OE.498522.
A novel intense electric field optical sensor based on Fabry-Perot interferometer utilizing LiNbO crystal is proposed and demonstrated. Compared to the traditional bulk-type electric field optical sensors, this sensor unit requires only a LiNbO and two collimators, eliminating the need for quarter wave-plate and allowing for measurement of electric field without limitation by half wave voltage. The Vernier effect, generated by birefringence of LiNbO, is utilized to enhance the sensitivity of electric field measurement, which does not require additional reference cavity. Both theoretical and experimental results illustrate that the wavelength shift of the sensor is linear function of the measured electric field. In the range of 0∼1010 kV/m, the sensor's measurement sensitivity is 2.22 nm/E (V/µm) with detection limit of 1.27 × 10 E. Additionally, an MZI is proposed for temperature compensation, resulting in a standard deviation of spectrum variation after compensation of only 5.01 × 10. Applications using this sensor confirmed that it is expected to find widespread use in measurements of intense transient electric fields.
提出并演示了一种基于法布里-珀罗干涉仪、利用铌酸锂（LiNbO）晶体的新型强电场光学传感器。与传统的体式电场光学传感器相比，该传感器单元仅需一块铌酸锂和两个准直器，无需四分之一波片，且电场测量不受半波电压限制。利用铌酸锂双折射产生的游标效应来提高电场测量灵敏度，无需额外的参考腔。理论和实验结果均表明，传感器的波长偏移是被测电场的线性函数。在0∼1010 kV/m范围内，传感器的测量灵敏度为2.22 nm/E (V/µm)，检测限为1.27 × 10 E。此外，还提出了一种用于温度补偿的马赫-曾德尔干涉仪（MZI），补偿后光谱变化的标准偏差仅为5.01 × 10。使用该传感器的应用证实，它有望在强瞬态电场测量中得到广泛应用。
