Precision spectroscopy with a single 40Ca+ ion in a Paul trap

doi:10.1088/1674-1056/24/5/054213

Abstract Precision measurement of the 4s ²S_1/2–3d ²D_5/2 clock transition based on ⁴⁰Ca⁺ ion at 729 nm is reported. A single ⁴⁰Ca⁺ ion is trapped and laser-cooled in a ring Paul trap, and the storage time for the ion is more than one month. The linewidth of a 729 nm laser is reduced to about 1 Hz by locking to a super cavity for longer than one month uninterruptedly. The overall systematic uncertainty of the clock transition is evaluated to be better than 6.5× 10^-16. The absolute frequency of the clock transition is measured at the 10^-15 level by using an optical frequency comb referenced to a hydrogen maser which is calibrated to the SI second through the global positioning system (GPS). The frequency value is 411 042 129 776 393.0(1.6) Hz with the correction of the systematic shifts. In order to carry out the comparison of two ⁴⁰Ca⁺ optical frequency standards, another similar ⁴⁰Ca⁺ optical frequency standard is constructed. Two optical frequency standards exhibit stabilities of 1× 10^-14τ^-1/2 with 3 days of averaging. Moreover, two additional precision measurements based on the single trapped ⁴⁰Ca⁺ ion are carried out. One is the 3d ²D_5/2 state lifetime measurement, and our result of 1174(10) ms agrees well with the results reported in [Phys. Rev. A 62 032503 (2000)] and [Phys. Rev. A 71 032504 (2005)]. The other one is magic wavelengths for the 4s ²S_1/2–3d ²D_5/2 clock transition; λ_|mj|= 1/2= 395.7992(7) nm and λ_|mj|= 3/2= 395.7990(7) nm are reported, and it is the first time that two magic wavelengths for the ⁴⁰Ca⁺ clock-transition have been reported.

Keywords: optical frequency standard precision spectroscopy Ca⁺ ion lifetime measurement magic wavelength

Received: 09 February 2015
Revised: 23 March 2015
Accepted manuscript online:

PACS:	42.62.Fi	(Laser spectroscopy)
	37.10.Ty	(Ion trapping)
	43.58.Hp	(Tuning forks, frequency standards; frequency measuring and recording instruments; time standards and chronographs)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821301 and 2005CB724502), the National Natural Science Foundation of China (Grant Nos. 11474318, 91336211, and 11034009), and Chinese Academy of Sciences.

Corresponding Authors: Gao Ke-Lin
E-mail: klgao@wipm.ac.cn

About author: 42.62.Fi; 37.10.Ty; 43.58.Hp

Cite this article:

Guan Hua (管桦), Huang Yao (黄垚), Liu Pei-Liang (刘培亮), Bian Wu (边武), Shao Hu (邵虎), Gao Ke-Lin (高克林) Precision spectroscopy with a single ⁴⁰Ca⁺ ion in a Paul trap 2015 Chin. Phys. B 24 054213

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Precision spectroscopy with a single 40Ca+ ion in a Paul trap

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Precision spectroscopy with a single ⁴⁰Ca⁺ ion in a Paul trap