摘要
针对原子重力仪激光系统在温度和振动变化时,操控原子的激光功率、激光器的频率和相位会出现长期漂移和短期高频抖动,影响原子重力仪测量精度的问题,设计了原子重力仪激光系统数字闭环控制方案。对回泵光、冷却光、探测光、吹除光和拉曼光进行实时闭环控制,抑制光功率起伏引入的噪声。实验结果表明,激光功率的实时闭环锁定时间为3.5μs@±5%,峰峰值长期稳定性为0.8%,能够实现偏振梯度冷却过程中所需的光功率线性扫描。所设计系统还可以用于激光器频率和相位锁定,实验中将激光频率锁定在电光调制器的边带,可以实现在电光调制器调制范围内激光器任意频点锁定,频率锁定切换时间小于4 ms@10 GHz。研制闭环系统能够降低原子重力仪激光系统复杂性,提升环境适应性,对原子重力仪的工程化具有积极的意义。
Aiming at the problem that the laser power of manipulating atoms,the frequency and phase of the laser will have long-term drift and short-term high-frequency jitter when the temperature or vibration of the laser system of the atomic gravimeter changes,which affects the measurement accuracy of the atomic gravimeter,a digital closed-loop control scheme for the laser system of the atomic gravimeter is designed.The real-time closed-loop control of pumping light,cooling light,detecting light,blowing-out light and Raman light is carried out to suppress the noise caused by the ups and downs of optical power.The experimental results show that the real-time locking time of the laser power is 3.5μs@±5%,the long-term stability of the peak-to-peak value is 0.8%,the optical power can be scanned linearly in the polarization gradient cooling process.The proposed system can also be used for laser frequency and phase locking,and the laser frequency is locked in the sideband of the electro-optical modulator in the experiment,which can realize any frequency locking of the laser within the modulation range of the electro-optical modulator,and the switching time of the frequency locking is less than 4 ms@10 GHz.The development of the closed-loop system can reduce the complexity of the laser system of the atomic gravity instrument,improve the environmental adaptability of the system,and has positive significance for the engineering of the atomic gravity instrument.
作者
赵远
许云鹏
汪子楷
贾钧洁
胡栋
王宇
ZHAO Yuan;XU Yunpeng;WANG Zikai;JIA Junjie;HU Dong;WANG Yu(Changcheng Institute of Metrology&Measurement,Beijing 100095,China)
出处
《中国惯性技术学报》
北大核心
2025年第5期495-501,共7页
Journal of Chinese Inertial Technology
基金
国防预研(jsjl2023xxxs001)。
关键词
原子重力仪
激光系统
光功率稳定
闭环控制
atomic gravimeter
laser system
optical power is stable
closed-loop control
