Recent progress of neutral mercury lattice clock in SIOM

8th Symposium on Frequency Standards and Metrology 2015

Zhao, R.C.^1,2,3 ; Fu, X.H.^1,2,3 ; Liu, K.K.^1,2,3 ; Gou, W.^1,2,3 ; Sun, J.F.^1,2 ; Xu, Z.^1,2,4 ; Wang, Y.Z.^1,2,4

Key Laboratory of Quantum Optics, Chinese Academy of Sciences, Shanghai

201800, China^1

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai

201800, China^2

University of Chinese Academy of Sciences, Beijing

100049, China^3

Center of Cold Atom Physics, Chinese Academy of Sciences, Shanghai

201800, China^4

关键词: Black body radiation;    External-cavity diode laser;    Frequency-doubling;    Laser amplifiers;    Magnetooptical traps;    Neutral mercury atoms;    Optical lattice clocks;    Recent progress;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012022/pdf
DOI  :  10.1088/1742-6596/723/1/012022

来源: IOP

【 摘 要 】

Neutral mercury atom is one of good candidates of optical lattice clock. Due to its large atomic number, mercury atom is insensitive to black body radiation, which is the severe limitation for the development of optical clocks. However, the challenge of neutral mercury lattice clock is the requirement of high power deep-UV lasers, especially for both the cooling laser and the lattice laser. Here, we report the recent progress of neutral mercury lattice clock in SIOM, including the development for laser cooling of mercury atom and the cooling laser system with fiber laser amplifier. We have realized the magneto-optical trap of mercury atoms and measured the parameters of cold mercury atoms. A home-made external cavity diode laser works as a seed laser for a room temperature 1014.8 nm fiber laser amplifier. A new efficient frequency-doubling cavity from 1015 nm to 507 nm has been developed.