为了抵消自然双折射引起的Pockels电场传感器的工作点漂移, 设计了一种基于波长控制的铌酸锂晶体强电场传感器。设计的传感器系统包括: 可调谐激光器、Pockels传感器、微控制单元及光电探测器。采用微控制器控制可调谐激光器的输出波长, 使传感器具有π的固有相位偏置, 即使传感器工作在线性区。仿真结果表明: 当设计的传感器晶体长度大于0.45mm时, 在1530 ~1565nm范围内可以找到使传感器工作在线性区的工作波长。最后结合传感器最大可测电场与半波电场之间的关系Emax≈0.3Eπ, 得出传感器晶体长度为6.32mm, 光沿z方向传播, x方向加电场, 传感器最大可测电场为1000kV/m, 此时调谐传感器的工作波长为1546.1nm可以使传感器工作在线性区。

In order to offset the drift of the operating point of the Pockels electric field sensor caused by natural birefringence, a strong electric field sensor based on wavelength control of lithium niobate crystal was designed. The sensor system is designed to include: tunable lasers, Pockels sensors, micro control units, and photodetectors. A microcontroller is used to control the output wavelength of the tunable laser so that the sensor has an inherent phase offset of π even if the sensor is operating in a linear region. The simulation results show that when the designed sensor crystal length is greater than 0.45mm, the operating wavelength of the sensor in the linear region can be found in the range of 1530~1565nm. Finally, combined with the relationship between the maximum measurable electric field and the half-wave electric field of the sensor, Emax≈0.3Eπ, the length of the sensor crystal is 6.32mm, the light propagates along the z direction, and the electric field is applied in the x direction. The maximum measurable electric field of the sensor is 1000kV/m. At this point, the tuning sensor's operating wavelength is 1546.1nm to allow the sensor to operate in the linear region.