A new concept for probe light intensity stability control and high-frequency modulation based on an acousto-optic modulation in a K-Rb-²¹Ne co-magnetometer is reported. The structure and optical path are ingeniously designed to avoid the interference of zero-order diffraction light. The average rotation rate sensitivity of is achieved under the light intensity closed-loop control condition and the bias instability calculated by the Allan deviation is improved from 0.13 deg h⁻¹ to 0.06 deg h⁻¹ comparing with open-loop scheme. A square wave modulation with a wide range of frequencies is applied to the probe light intensity and the appropriate modulation frequency for the co-magnetometer is tested to be 10 kHz to 300 kHz and megahertz scale. Finally, the closed-loop control of light intensity has been combined with the high-frequency modulation, which could suppress the low-frequency noise contained in the probe system and improve the long-term stability of the angular velocity measurement.

报道了一种在K-Rb- ²¹ Ne共磁计中基于声光调制的探测光强度稳定性控制和高频调制的新概念。结构和光路经过精心设计，避免了零级衍射光的干扰。 在光强度闭环控制条件下获得的平均转速灵敏度，并且通过Allan偏差计算出的偏置不稳定性从0.13 deg h ^-1提高到0.06 deg h ^-1与开环方案比较。将具有宽范围频率的方波调制应用于探头光强度，并测试了适用于共磁计的合适调制频率为10 kHz至300 kHz和兆赫兹刻度。最后，将光强度的闭环控制与高频调制相结合，可以抑制探头系统中包含的低频噪声，并提高角速度测量的长期稳定性。