Progress on the
40
Ca
+
ion optical clock
Zhang Baolin
1, 2, 3
, Huang Yao
1, 2
, Zhang Huaqing
1, 2, 3
, Hao Yanmei
1, 2, 3
, Zeng Mengyan
1, 2, 5
, Guan Hua
1, 2, †
, Gao Kelin
1, 2, 4, ‡
Vacuum chamber and fluorescence collection devices of a
40
Ca
+
ion optical clock.
