We report the results of theoretical and experimental studies of a digital system for regulating and stabilising the frequency of a four-frequency Zeeman laser gyroscope (ZLG), in which generation occurs simultaneously on two longitudinal modes with orthogonal circular polarisations; therefore, four light waves propagate in the optical ring resonator. In contrast to a two-frequency Zeeman laser gyroscope, a four-frequency ZLG does not use the intensity modulation signal of one of the light waves, which appears when an alternating magnetic field is applied to the active medium, to analyse the frequency detuning of longitudinal modes from the centre of the active-medium gain contour. At the same time, it is possible to construct a digital perimeter adjustment system (PAS), which allows the resonator perimeter to be adjusted so that the magnetic components of the zero drift of the gyroscope for two longitudinal generation modes are equal and opposite in sign. Due to this, almost complete compensation for the magnetic component of the zero drift of the gyroscope is realised in a four-frequency ZLG. The use of the digital system makes it possible to provide a higher accuracy of the resonator perimeter adjustment than that in a two-frequency ZLG, even with a relatively small bit capacity of the PAS digital-to-analogue conversion (DAC), and to fully take advantage of the capabilities of a four-frequency ZLG to reduce the magnetic sensitivity.

我们报告了用于调节和稳定四频塞曼激光陀螺仪 (ZLG) 频率的数字系统的理论和实验研究结果，其中生成同时发生在具有正交圆偏振的两个纵向模式上；因此，四个光波在光学环形谐振器中传播。与双频塞曼激光陀螺仪相比，四频 ZLG 不使用其中一个光波的强度调制信号，当对活性介质施加交变磁场时，会出现这种光波的强度调制信号来分析频率失谐。来自有源介质增益轮廓中心的纵向模式。同时，可以构建数字周界调整系统（PAS），这允许调整谐振器周长，以使陀螺仪零漂移的两个纵向产生模式的磁分量相等且符号相反。因此，在四频 ZLG 中实现了对陀螺仪零漂移磁分量的几乎完全补偿。使用数字系统可以提供比双频 ZLG 更高的谐振器周长调整精度，即使 PAS 数模转换 (DAC) 的比特容量相对较小，并且充分利用四频 ZLG 的功能来降低磁灵敏度。在四频 ZLG 中实现了对陀螺仪零漂移磁分量的几乎完全补偿。使用数字系统可以提供比双频 ZLG 更高的谐振器周长调整精度，即使 PAS 数模转换 (DAC) 的比特容量相对较小，并且充分利用四频 ZLG 的功能来降低磁灵敏度。在四频 ZLG 中实现了对陀螺仪零漂移磁分量的几乎完全补偿。使用数字系统可以提供比双频 ZLG 更高的谐振器周长调整精度，即使 PAS 数模转换 (DAC) 的比特容量相对较小，并且充分利用四频 ZLG 的功能来降低磁灵敏度。