Comparison of two single-ion optical frequency standards at the sub-Hertz level

Details Comparison of two single-ion optical frequency standards at the sub-Hertz level Comparison of two single-ion optical frequency standards at the sub-Hertz level

2004-02-25

arxiv.org/abs/physics/0402120v1

in "Laser Spectroscopy", Proceedings of the XVI conference, Eds.: P. Hannaford, A. Sidorov, H. Bachor, K. Baldwin (World Scien

Physics

Atomic Physics

To appear in "Laser Spectroscopy XVI", eds: P. Hannaford, A. Sidorov, H. Bachor, and K. Baldwin (World Scientific, Singapore,

Scientific paper

We describe experimental investigations on an optical frequency standard based on a laser cooled 171Yb+ ion confined in a radiofrequency Paul trap. The electric-quadrupole transition from the 2S1/2(F=0) ground state to the 2D3/2(F=2) state at the wavelength of 436 nm is used as the reference transition. The reference transition is probed by a frequency-doubled, frequency-stabilized diode laser and is resolved with a Fourier-limited full halfwidth of approximately 30 Hz. In order to compare two 171Yb+ standards, separate frequency shift and servo systems are employed to stabilise the probe frequency to the reference transition line centers of two independently stored 171Yb+ ions. The present experimental results indicate a relative instability (Allan standard deviation)of the optical frequency difference between the two systems of sigma_y(1000 s)=1.0E-15 and a mean frequency difference of 0.2 Hz. Shifts in the range of several Hertz are observed in the frequency difference if a stationary electric field gradient is superimposed on the radiofrequency trap field. This measurement permits a first experimental estimate of the electric quadrupole moment of the 2D3/2 state of Yb+.

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