An Optical Clock Based on Coherent Population Trapping of Alkaline-earth Ions

Details An Optical Clock Based on Coherent Population Trapping of Alkaline-earth Ions An Optical Clock Based on Coherent Population Trapping of Alkaline-earth Ions

2009-04-02

arxiv.org/abs/0904.0285v1

Physics

Optics

12 pages, 2 figures

Scientific paper

An ultra-stable optical clock based on coherent population trapping effect of alkaline-earth ions, such as Ca$^+$, Sr$^+$, Ba$^+$, is analyzed here. The proposed transitions use the odd isotopes, so that the frequency shift is insensitive to the applied magnetic field. To enhance the signal, a large number of ions are trapped in a linear Paul trap, and laser cooled to crystallize such that the ions are in the Lamb-Dicke regime to avoid first order Doppler shift. Other relevant frequency shifts are also analyzed. Further techniques to improve the stability of the clock signal are discussed.

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