Open AccessPrecision spectroscopy of helium using a laser-cooled atomic beam
Author(s) -
Sun Yu,
Feng Gao-Ping,
Cheng Cun-Feng,
Tu Le-Yi,
Heng Pan,
Yang Guo-Min,
Shui-Ming Hu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.170601
Subject(s) - sideband , atomic physics , physics , metastability , laser cooling , laser , helium , spectroscopy , optics , beam (structure) , noise (video) , materials science , quantum mechanics , artificial intelligence , microwave , computer science , image (mathematics)
The 23P0,1,2 fine structure interval of 4He can be determined to 10-8 accuracy both theoretically and experimentally. It can be used either to determine the fine structure constant or to test the quantum electrodynamics theory. To reach this goal, it is necessary to measure the fine structure splitting to sub kHz accuracy by increasing the signal-to-noise ratio and eliminating the systematic deviations. In the experimental configuration of present study, transverse laser cooling is used to obtain an intense metastable helium atom beam. The triple state metastable atoms are also bent from the original atomic beam to reduce the background noise. The spectral scanning will be accomplished by tuning the sideband of a frequency-locked diode laser to maintain sufficient frequency stability during the scan. The experimental method has been tested on the setup recently built, and the analysis shows that a sub-kHz precision is feasible.