Miniaturization of physics system in Sr optical clock

doi:10.7498/aps.67.20172584

NTSC-IR

	Miniaturization of physics system in Sr optical clock
	Zhao Fang-Jing 1,2; Gao Feng 1; Han Jian-Xin 1,2; Zhou Chi-Hua 1; Meng Jun-Wei 1; Wang Ye-Bing 1,2; Guo Yang 1,2; Zhang Shou-Gang 1; Chang Hong1
	2018-03-05
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
卷号	67 期号:5 页码:8
摘要	The compactness and robustness of the vacuum setup are the major limitations to develop transportable and space-borne optical clocks. The first step in the engineering challenge is to reduce volume and weight with respect to a stationary system. In this paper, we present the realization of a miniaturized vacuum system by building two anti-Helmholtz coils inside the vacuum magneto-optical-trap ( MOT) chamber. The built-in coils are specially designed to minimize the distance between the coils, and in this way it is possible to reduce the current needed to realize a typical magnetic gradient of 40 Gs/cm required for blue MOT. When the MOT coil current is 2 A, an axial magnetic field gradient of 43 Gs/cm is obtained in the center of the MOT, which is enough for the first stage Doppler cooling. This novel design allows us to reduce size, weight and power consumption with respect to a traditional laser cooling apparatus, and simultaneously avoid complicating the water cooling equipment. Our vacuum system has a size of 60 cm x 20 cm x 15 cm, about 1/10 of the original system in the laboratory. In addition, the circularly polarized Zeeman slowing laser is sent to counter propagating atomic beam, and atoms at a few hundred meters per second are now routinely slowed down to velocities of tens of meters per second. As a result, about 16.4% of the atoms are actually trapped into the blue MOT. The final temperature of the blue MOT is approximately 10.6 mK, and the internal diameter is 1.5 mm by observing the expansion of the atoms from the MOT. The populations of cold atoms finally trapped in the MOT are 1.6 x 10(6) of Sr-88 and 1.5 x 10(5) of Sr-87. The S-1(0) -> P-1(1) transition used for the blue MOT is not perfectly closed due to the decay channel of the 5p(1)P(1) -> 4d(1)D(2), and a part of atoms are stored in the P-3(2) and P-3(0) states. To prevent the atoms from losing, 707 and 679 nm repumping lasers are employed to recycle these atoms in the P-3(1) state, and then the atoms decay to the ground state S-1(0). Now the typical number of loaded atoms dramatically increases by 5 times compared with before. The slowing efficiency of Zeeman slower is also optimized for the operation with deceleration related to the parameter of magnet length, which uses more effectively available magnetic field distribution, in contrast to the usual constant deceleration mode. Our future work will focus on constructing a Zeeman slower combined with permanent magnets or an electric magnet for better tuning of the magnetic field.
关键词	compact Sr optical clock built-in anti-Helmholtz coil space-borne cold atom optical clock
资助者	Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences
DOI	10.7498/aps.67.20172584
关键词[WOS]	COLD ATOMS ; LATTICE CLOCKS ; SPACE ; LASER ; TEMPERATURE ; STRONTIUM ; TRAP ; ACES
语种	英语
资助项目	Young Scientists Fund of the National Natural Science Foundation of China[11603030] ; National Natural Science Foundation of China[11474282] ; National Natural Science Foundation of China[61775220] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB21030700] ; Key Research Project of Frontier Science of the Chinese Academy of Sciences[QYZDB-SSW-JSC004]
资助者	Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Young Scientists Fund of the National Natural Science Foundation of China ; Young Scientists Fund of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000428113900008
出版者	CHINESE PHYSICAL SOC
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/11501
专题	中国科学院国家授时中心
通讯作者	Gao Feng; Chang Hong
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Key Lab Time & Frequency Primary Stand, Xian 710600, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao Fang-Jing,Gao Feng,Han Jian-Xin,et al. Miniaturization of physics system in Sr optical clock[J]. ACTA PHYSICA SINICA,2018,67(5):8.
APA	Zhao Fang-Jing.,Gao Feng.,Han Jian-Xin.,Zhou Chi-Hua.,Meng Jun-Wei.,...&Chang Hong.(2018).Miniaturization of physics system in Sr optical clock.ACTA PHYSICA SINICA,67(5),8.
MLA	Zhao Fang-Jing,et al."Miniaturization of physics system in Sr optical clock".ACTA PHYSICA SINICA 67.5(2018):8.