Optical frequency standard based on a single 40Ca+

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Optical frequency standard based on a single 40Ca+
Author(s)
Gao Ke-Lin
Affiliation(s)
The Chinese Academy of Sciences
KEYWORDS
Optical frequency standard based on a single 40Ca+
ABSTRACT
Optical frequency standards have recently been significantly developed thanks to the invention of trapping and cooling the atoms, optical frequency comb technology and ultranarrow-linewidth lasers. Optical frequency standards are expected to take the place of the Cs primary microwave standard as the definition of the SI second in the near future. And they can be used to test fundamental physical theory (such as relativity theory) and the variance of the physical constant (such as fine structural constant). A single Ca+ ion has been proposed to be one of the candidates for the future frequency standards. Research on the development of the optical frequency standard based on trapped and cold 40Ca+ with the 4s 2S1/2-3d 2D5/2 clock transition at 729 nm is reported. The two 40Ca+ optical frequency standard had been set up. A single calcium ion was trapped and laser cooled in the Paul trap and stay in trap for more than 60 days. The linewidth of a 729 nm laser was reduced to less than 1 Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 5×10-17. The absolute frequency of the clock transition was measured at 10-15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system (GPS).