高精度冷原子干涉仪集成化光学系统的设计

Design of integrated optical system for high‑precision cold atom interferometer

设计并实现了用于85Rb冷原子干涉仪的集成化光学系统。整个光学系统的外包络尺寸为400 mm×483 mm×133 mm,分为五个独立的模块,模块之间通过光纤连接,这种集成化、模块化的光路系统有利于原子干涉仪进一步工程化、小型化。该系统采用主动温控措施来改善光学系统的稳定性,使激光光强的长期稳定度达到4.3×10^(-3)@5000 s。将该光学系统应用于原子干涉仪,获得了自由演化时间为71 ms、对比度为20%的干涉条纹,单个条纹相位不确定度约为22 mrad,对应的重力测量不确定度为26μGal。该光学系统的设计与实现为原子干涉仪的小型化与实际应用奠定了基础。

An integrated optical system for cold 85Rb atom interferometer is designed and implemented in this work.The system includes five fiber-connected modules,and the size of the entire optical system is only 400 mm×483 mm×133 mm.This integrated and modular optical system is beneficial for further engineering and miniaturization of atomic interferometers.An active temperature control method is adopted to improve the stability of the optical system,and the long-term stability of laser intensity reaches 4.3×10^(-3)@5000 s.This optical system has been successfully applied to an atom interferometer,and the interference fringes with a free evolution time of 71 ms and a contrast of 20%are obtained.The phase uncertainty of a single fringe is 22 mrad,and the corresponding gravitational measurement uncertainty is 26μGal.The design and implementation of this optical system lays the foundation for the miniaturization and practical application of atom interferometers.