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Chin. Opt. Lett.
 Home  List of Issues    Issue 06 , Vol. 16 , 2018    10.3788/COL201816.060202


Observation of the 1S03P0 optical clock transition in cold 199Hg atoms
Xiaohu Fu1;2;3, Su Fang1;2, Ruchen Zhao1;2, Ye Zhang1;2;3, Junchao Huang1;2;3, Jianfang Sun1;2, Zhen Xu1;2;3;4, and Yuzhu Wang1;2;3;4
1 [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences], Shanghai 201800, China
2 [Key Laboratory of Quantum Optics, Chinese Academy of Sciences], Shanghai 201800, China
3 [University of Chinese Academy of Sciences], Beijing 100049, China
4 [Center of Cold Atom Physics, Chinese Academy of Sciences], Shanghai 201800, China

Chin. Opt. Lett., 2018, 16(06): pp.060202

DOI:10.3788/COL201816.060202
Topic:Atomic and molecular physics
Keywords(OCIS Code): 020.1335  300.6210  

Abstract
We report on the observation of the highly forbidden 1S0–3P0 optical clock transition in laser-cooled 199Hg atoms. More than 95% depletion of cold 199Hg atoms is detected in the magneto-optical trap. Using the free-of-field detection method, the AC Stark shift from the cooling laser is removed from the in-field spectroscopy. At low-power clock laser pumping, the linewidth of the clock spectroscopy is approximately 450 kHz (full width at half-maximum), which corresponds to a Doppler broadening at the atom temperature of 60 μK. We determine the 1S0–3P0 transition frequency to be 1,128,575,290.819(14) MHz by referencing with a hydrogen maser and measuring with a fiber optical frequency comb. Moreover, a weak Doppler-free signal is observed.

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Received:2018/3/2
Accepted:2018/4/19
Posted online:2018/5/25

Get Citation: Xiaohu Fu, Su Fang, Ruchen Zhao, Ye Zhang, Junchao Huang, Jianfang Sun, Zhen Xu, and Yuzhu Wang, "Observation of the 1S03P0 optical clock transition in cold 199Hg atoms," Chin. Opt. Lett. 16(06), 060202(2018)

Note: This work was supported by the National Natural Science Foundation of China (NSFC) (No. 91436105) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB21030200). We thank Qunfeng Chen, Longsheng Ma, and Yanyi Jiang for helpful discussions on the design and testing of the ultra-stable laser; Lei Zhang and Yan Feng for their design and development of the fiber amplifier at 1062.5 nm; and we also acknowledge Tang Li for supplying us with the optical frequency comb and hydrogen maser.



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