紧锁喷泉钟小型化光学系统研究  

Investigation on Miniaturized Optical System for Rapid Steering Fountain Clock

作　　者：杜超 宋文霞 陈伟亮[2] 刘昆[2] 郑发松 戴少阳 左娅妮 房芳[2] DU Chao;SONG Wenxia;CHEN Weiliang;LIU Kun;ZHENG Fasong;DAI Shaoyang;ZUO Yani;FANG Fang(Liaoning Petrochemical University,Fushun 113001,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]辽宁石油化工大学,抚顺113001 [2]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2023年第7期40-44,共5页Metrology Science and Technology

基　　金：国家市场监督管理总局科技计划项目(2022MK174);中国计量科学研究院基本科研业务费重点领域项目子课题(AKYZD2201-2)。

摘　　要：紧锁喷泉钟是实现紧驾驭氢钟守时的频率基准装置,为适应守时要求,需要提升紧锁喷泉钟运行可靠性和稳定度。光学系统作为其最脆弱的系统组成,易受温度等环境因素的影响,导致原子云温度、原子数波动,恶化其频率稳定度。通过降低光高、减少光程、减少弹性调节架、合理布局光路,给出一种运用于紧锁喷泉钟的小型化光学系统。该系统利用波片偏振分光镜组合、竖置声光调制器、猫眼双次通过声光调制器等新设计,将所有光路装置集成在一块400 mm×600 mm的标准25 mm孔距光学平板上。利用泡沫包裹整个光学系统进行温度波动测试,当温度变化12℃时,其最长光路的光纤后光功率波动小于6.6%,有效提升了喷泉钟光学系统的紧凑性和稳定性。该小型化光学系统运用到紧锁铷喷泉钟上,实现了天原子波动数5.28%,喷泉钟频率天稳定度5.57E-16。The Rapid Steering Fountain Clock is a frequency reference device pivotal for steering hydrogen maser timekeeping.To fulfill time-keeping demands,enhancing the operational reliability and stability of the rapid-steering fountain clock is crucial.The optical system,being the most vulnerable component,is susceptible to environmental factors like temperature,causing fluctuations in atomic cloud temperature and atomic number,thereby deteriorating frequency stability.This study proposes a miniaturized optical system for the rapid-steering fountain clock,achieved by lowering light height,minimizing light path,reducing elastic adjustment frames,and optimizing optical path layout.Utilizing new designs such as waveplate polarizing beamsplitter combination,vertically positioned acousto-optic modulator,and double-pass through cateye acousto-optic modulator,all optical devices are integrated onto a 400mm×600mm optical bench with a standard 25 mm hole spacing.The entire optical system,wrapped in foam,underwent temperature fluctuation testing,revealing that with a 12℃temperature change,the optical power fluctuation post-optical fiber in the longest optical path is below 6.6%,significantly improving the compactness and stability of the fountain clock optical system.When applied to the rapidsteering rubidium fountain clock,a daily atomic number fluctuation of 5.28%and a fountain clock frequency daily stability of 5.57E-16 were achieved.

关 键 词：计量学 紧锁 喷泉钟 稳定度 光学系统 小型化 

分 类 号：TB939[一般工业技术—计量学]