铌酸锂光学电场传感器温度稳定性改善研究

LiNbO₃ crystal has been widely used in various electric field sensors due to its high electro-optic coefficient and stable physical and chemical properties. However, the refractive index of LiNbO₃ crystal is sensitive to temperature. When using the direction of maximum electro-optic effect, the natural birefringence causes the crystal working point to drift with temperature. On the one hand, this makes the sensor work unstably, on the other hand, it also affects the sensitivity and dynamic range of the sensor. To eliminate this effect, two LiNbO₃ crystals with equal optical path and orthogonal principal axes will be used in the probe. One is sensing crystal and the other is compensation crystal. Due to the compensation crystal, the natural birefringence of the sensor is greatly suppressed, and the temperature stability is also improved. The experimental results show that the working state stability of the compensated sensor is much better than that of the uncompensated sensor.