Zero-crossing temperature of ultra-stable optical reference cavity measured by optical transition spectrum

doi:10.7498/aps.70.20201721

NTSC-IR

	Zero-crossing temperature of ultra-stable optical reference cavity measured by optical transition spectrum
	Li Ting 1,2; Lu Xiao-Tong 1,2; Zhou Chi-Hua 1,2; Yin Mo-Juan 1; Wang Ye-Bing 1; Chang Hong1,2
	2021-04-05
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
卷号	70 期号:7 页码:6
摘要	In an experimental system of Sr-87 atomic optical lattice clock, the free-running 698 nm diode laser is locked in an ultra-stable optical reference cavity to obtain the ultra-stable narrow linewidth laser with good short-term frequency stability. The ultra-stable optical reference cavity, which is usually composed of glass material doped with titanium dioxide for ultra-low thermal expansion coefficient and two highly reflective fused quartz mirrors, is called ULE cavity. The cavity length is prone to being affected by mechanical vibration, temperature change, airflow, etc. The stability of the cavity length determines the stability of the final laser frequency. Near the room temperature, there exists a special temperature point for the ultra-low expansion glass material, at which temperature its thermal expansion coefficient becomes zero, which is called the zero-crossing temperature. At the zero-crossing temperature, the length of the ULE cavity is not sensitive to the temperature fluctuation, reaching a minimum value, and the laser locked to the ULE cavity has a minimum frequency drift. In order to reduce the influence of temperature on the laser frequency instability, the zero-crossing temperature of the ultra-stable optical reference cavity of 698 nm ultra-stable narrow linewidth laser system is measured by using the clock transition spectrum of the strontium atomic optical lattice clock. The frequency drift and frequency instability of the 698 nm ultra-stable narrow linewidth laser system at zero-crossing temperature are measured by using the change of the in-loop locked clock frequency of strontium atomic optical lattice clock. By scanning the atomic clock transition frequencies at different temperatures, the clock transition spectra at different temperatures are obtained. The second order polynomial fitting of the central frequency of the clock transition spectrum with the change curve of temperature is carried out, and the zero-crossing temperature of the 698 nm ultra-stable narrow linewidth laser system ULE cavity is measured to be 30.63 degrees C. At the zero-crossing temperature, the 698 nm ultra-stable narrow linewidth laser frequency is used for in-loop locking of Sr-87 atomic optical lattice clock. The linear drift rate of the ULE cavity in the 698 nm ultra-stable narrow linewidth laser system is measured to be 0.15 Hz/s, and the frequency instability of the 698 nm ultra-stable narrow linewidth laser system is 1.6 x 10(-15) at an average time of 3.744 s. The determination of ULE cavity zero-crossing temperature for the 698 nm ultra-stable narrow linewidth laser system is of great significance in helping to not only improve the instability of the laser system, but also increase the instability of Sr-87 optical lattice clock system. In the future, we will improve the temperature control system of the ULE cavity in the 698 nm clock laser system, enhancing the temperature control accuracy of the ULE cavity and reducing the measurement error, thus achieving a more accurate zero-crossing temperature and further improving the frequency instability of the 698 nm ultra-stable narrow linewidth laser system.
关键词	ultra-stable optical reference cavity frequency drift clock transition spectra zero-crossing temperature
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences
DOI	10.7498/aps.70.20201721
语种	英语
资助项目	National Natural Science Foundation of China[11803042] ; National Natural Science Foundation of China[61775220] ; National Key R&D Program of China[2016YFF0200201] ; Key Research Project of Frontier Science of the Chinese Academy of Sciences[QYZDB-SSW-JSC004] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2019400]
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000637968800011
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/361003/11045
专题	中国科学院国家授时中心
通讯作者	Wang Ye-Bing; Chang Hong
作者单位	1.Chinese Acad Sci, Key Lab Time & Frequency Primary Stand, Natl Time Serv Ctr, Xian 710600, 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	Li Ting,Lu Xiao-Tong,Zhou Chi-Hua,et al. Zero-crossing temperature of ultra-stable optical reference cavity measured by optical transition spectrum[J]. ACTA PHYSICA SINICA,2021,70(7):6.
APA	Li Ting,Lu Xiao-Tong,Zhou Chi-Hua,Yin Mo-Juan,Wang Ye-Bing,&Chang Hong.(2021).Zero-crossing temperature of ultra-stable optical reference cavity measured by optical transition spectrum.ACTA PHYSICA SINICA,70(7),6.
MLA	Li Ting,et al."Zero-crossing temperature of ultra-stable optical reference cavity measured by optical transition spectrum".ACTA PHYSICA SINICA 70.7(2021):6.