用于铷原子干涉仪的小型化光路设计  

Design of miniaturized optical system for 87Rb atom interferometer

作　　者：贾钧洁 赵远 汪子楷 许云鹏 胡栋 陈雷 JIA Junjie;ZHAO Yuan;WANG Zikai;XU Yunpeng;HU Dong;CHEN Lei(AVIC Changcheng Institute of Metrology&Measurement,Beijing 100095,China)

机构地区：[1]中国航空工业集团公司北京长城计量测试技术研究所,北京100095

出　　处：《计测技术》2024年第6期50-58,共9页Metrology & Measurement Technology

摘　　要：为使铷原子干涉仪小型化的同时提升应用可靠性,研制了一套集成化光学系统。运用模块化设计思路将系统分为光纤激光器、空间光路和稳频光路三个独立模块,便于安装和调试。采用自研的小型化光学结构件,通过优化空间光路和光纤激光器设计,大大缩小了空间光路体积,空间光路的尺寸仅为120 mm×190 mm×26 mm,重量为900 g,稳频光路的尺寸仅为50 mm×70 mm×40 mm。采用环氧树脂胶或螺纹将所有光学元件固定在光学底板上,不含弹簧结构的光学调整架有效提升了空间光路稳定性,保证了空间光路系统的应力稳定性和热稳定性。此外,对两个空间光路模块分别进行了精密温控设计,经高低温实验验证,在0~40℃的温度条件下,内部温度起伏在0.1℃以内,冷却光功率峰峰值起伏小于8%,空间光路的可靠性得到进一步提升。该集成化光学系统应用于动态原子干涉仪后,原子干涉仪的静态测量灵敏度达到323.4μGal√Hz@T=20 ms,长期稳定性为10.3μGal@1000 s。此设计为实现原子干涉仪的小型化与实际应用提供了有效方案。To tackle the challenges of miniaturization and enhanced application reliability in 87Rb atom interferometers,an integrated optical system has been devised.Adopting the philosophy of modular design,the system is divided into three modules:fiber laser,spatial optical path and frequency stabilization,for easy installation and adjustment.By employing self-developed miniaturized optical components and optimizing the design of the spatial optical path and fiber laser,a substantial reduction in the size of the spatial optical path has been achieved,only with dimensions of 120 mm×190 mm×26 mm and a weight of 900 g.The optical path of frequency stabilization just has dimensions of 50 mm×70 mm×40 mm.All optical elements are securely fixed onto the optical baseplate using epoxy resin glue or screws.The design has avoided spring-loaded optical mounts,ensuring stress and thermal stability and effectively enhancing the stability of the spatial optical path.Furthermore,the precise temperature controls have been implemented for both spatial optical path modules.The reliability of the spatial optical path has been further enhanced.During temperature experiment ranging from 0℃ to 40℃,the internal temperature fluctuation is less than 0.1℃,and the peak-to-peak power fluctuation is less than 8%.The integrated optical system achieves a sensitivity of 323.4μGal/√Hz@T=20 ms in dynamic atom interferometer and long-term stability of 10.3μGal@1000 s.This design provides an effective solution for the miniaturization and practical application of atomic interferometers.

关 键 词：绝对重力测量 原子干涉仪 光纤激光器 空间光路 小型化 调制转移谱稳频 

分 类 号：TB96[机械工程—光学工程] V241.6[一般工业技术—计量学] O431.2[机械工程—测试计量技术及仪器]