AUTHOR=Wang Xiumei , He Jin , Wang Yifei , Wang Yunjia , Wang Wenming , Wang Weili , Li Shiguang , Zhu Xi , Liu Guodong , Liu Shuo , Wang Ye , Wang Liang , Liu Yaxuan , Yang Tongmin , Cao Chunyan , Wei Yiqun , Yue Yutao , Hu Guoqing , Liu Zhenfeng , Pan Yimin , Gao Lianshan 

TITLE=Construction of optical system for an atomic clock-beyond atomic fountain

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.971099

DOI=10.3389/fphy.2022.971099

ISSN=2296-424X

ABSTRACT=We demonstrate the construction of the optical system in beyond fountain based on 87Rb atom. The optical system includes a high-stability laser system and an optical lattice. The high-stability laser system with a new scheme of frequency locking and shift is introduced in detail, which is an important laser source for laser cooling and trapping. The optimized frequency and intensity stability are achieved to 4E-14*tao^（-1/2）and 4E-5*tao^（-1/2, respectively, which are highly stable. On the basis of conventional atomic fountain clock, the optical lattice is specially investigated along the direction of gravity and its characteristics are studied systematically. For the optimized and novel exploration, we predict the achievable stability of 3.6E-14*tao^（-1/2）and it has the potential to be improved to 3.6E-15*tao^（-1/2） in future. The realizability of this construction due to stabilized laser and optical lattice makes the beyond fountain promising candidate for the next-generation high performance microwave atomic clock.