Interrogation of spin polarized clock transition in strontium optical lattice clock

doi:10.7498/aps.67.20172759

	Interrogation of spin polarized clock transition in strontium optical lattice clock
	Guo Yang 1,2; Yin Mo-Juan 1; Xu Qin-Fang 1; Wang Ye-Bing 1,2; Lu Ben-Quan 1,2; Ren Jie 1; Zhao Fang-Jing 1,2; Chang Hong 1
刊名	ACTA PHYSICA SINICA
	2018-04-05
卷号	67 期号:7 页码:8
关键词	strontium optical lattice clock observation of clock transition the spin-polarized spectrum
ISSN号	1000-3290
DOI	10.7498/aps.67.20172759
英文摘要	We demonstrate a spin-polarized clock transition spectrum of the Sr-87 optical lattice clock. The clock transition 5s(2) S-1(0) -> 5s5p P-3(0) of isotope Sr-87 has a hyperfine structure due to non-zero nuclear spin, inducing ten pi-polarized transitions from each individual m(F) state under the condition of a bias magnetic field along the probing polarization axis. In this experiment, atoms are driven to a certain m (F) state by a circular-polarization pump light to maximize the atomic population, which is beneficial to the stability and uncertainty evaluation of the optical lattice clock. After two stages: cooling and trapping, about 3. 5 x 10(6) atoms are trapped in the red magneto-optical trap with a temperature of 3.9 mu K. A grating-feedback external cavity diode laser with a tapered amplifier is used to build the optical lattice with a "magic-wavelength" of 813.426 nm. Both waists of the counter-propagating lattice beam along the horizontal direction are overlapped to form a one-dimensional optical lattice. The lifetime of the atoms trapped in the 1 D optical lattice is 1600 ms. The clock laser at 698 nm is a grating-feedback diode laser, which is locked to an ultra-low expansion cavity by the Pound-Drever-Hall technique to stabilize the frequency and phase. As a result, the linewidth of clock laser is narrowed to Hz level. By the normalized shelving method, we obtain a resolved sideband spectrum of Sr-87 5s(2) S-1(0) -> 5s5p P-3(0) transition. According to the spectrum, the lattice temperature along the longitudinal direction is approximately 4.2 mu K. After that a linewidth of 6.7 Hz of the degenerate clock transition is obtained at a probing time of 150 ms by utilizing a three-dimensional (3 D) bias magnetic field, which is used to eliminate the stray magnetic fields. Then a small bias magnetic field of 300 mGs is applied along the polarization axis of the lattice light to achieve the spectrum of Zeeman magnetic sublevels of the clock transition. Furthermore, the m(F) = +9/2 and m(F) = -9/2 magnetic sublevels are picked to be respectively pumped by the sigma(+)-polarized and sigma(-)-polarized light at 689 nm, a variable liquid crystal wave plate is employed to switch on both polarizations. Finally, the spin polarized clock transition spectrum is obtained at the interrogating pulse of 150 ms, and the linewidths of the m(F) = +9/2, m(F) = -9/2 magnetic sublevel transitions are 6.8 Hz and 6.2 Hz respectively.
资助项目	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]
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000443194200009
资助机构	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 ; 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 ; 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 ; 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
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/11652]
专题	中国科学院国家授时中心
通讯作者	Chang Hong
作者单位	1.Chinese Acad Sci, Key Lab Time & Frequency Primary Stand, Natl Time Serv Ctr, 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	Guo Yang,Yin Mo-Juan,Xu Qin-Fang,et al. Interrogation of spin polarized clock transition in strontium optical lattice clock[J]. ACTA PHYSICA SINICA,2018,67(7):8.
APA	Guo Yang.,Yin Mo-Juan.,Xu Qin-Fang.,Wang Ye-Bing.,Lu Ben-Quan.,...&Chang Hong.(2018).Interrogation of spin polarized clock transition in strontium optical lattice clock.ACTA PHYSICA SINICA,67(7),8.
MLA	Guo Yang,et al."Interrogation of spin polarized clock transition in strontium optical lattice clock".ACTA PHYSICA SINICA 67.7(2018):8.