Recent improvements on the atomic fountain clock at SIOM*
Du Yuan-Boa),b), Wei Rong†a), Dong Ri-Changa),b), Zou Fana),b), Wang Yu-Zhua)
       
(a) Geometry diagrams of the Ramsey cavity, where labels 1 and 2 indicate the two microwave coupling ports. (b) The measured reflection curve S 11 and S 22 of the Ramsey cavity, which denotes the return loss before (dot: S 11, dash dot: S 22) and after the improvement (dashed line: S 11, solid line: S 22).