铷频标物理系统的改进研究

摘要

Physics package is the key assembly of rubidium frequency standards ( RFS) .By analy-zing the factors affecting frequency stability , the interior structure of physics package is modified .This physics package is designed according to the three cells scheme , in which an optical filter and a magne-tron microwave cavity are used.A preliminary test shows that the temperature coefficient (TC) is 9.7× 10-14/℃and the frequency stability of the RFS is nearly 1×10-12 -1/2(1s≤ ≤10 000s).%物理系统是铷频标的核心部件，通过分析影响频率稳定度的因素，对物理系统内部结构进行了改进。改进后的物理系统采用分离滤光的三泡结构，增加了光学滤光技术，此外，物理系统还选用了磁控管微波腔。经测试，改进后的铷频标温度系数为9．7×10-14/℃，频率稳定度约为1×10-12/（1s≤≤10000s）。