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• W1618421884 abstract "The present decade has seen great advances in optical frequency standards following the development of femtosecondlaser frequency combs. With this technology, combined with a stable and narrow probe laser source(50-100 Hz linewidth), we made a systematic study of the 5 s 2 S 1/2 -4 d 2 D 5/2 (S-D) transition frequency of the 88 Sr + ion as a function of the quantization axis in the trap. This study revealed the presence of systematic shiftscaused by residual micromotion in our rf Paul trap and led to an evaluation of those shifts. Also, a methodwas developed based on the measurement of the Zeeman spectrum of the clock transition to cancel the electricquadrupole shift caused by patch potentials on the trap electrodes. From these results, we also determined theabsolute frequency of the S-D clock transition frequency at 674 nm with a fractional frequency uncertainty of3.4 × 10 -14 . We have since made improvements to our probe laser system and have observed 5 Hz Fouriertransform limited linewidths on a Zeeman component of the S-D transition of the 88 Sr + ion. To observe sucha narrow transition it is essential to have a known and well behaved drift of the laser frequency during thefew minutes it takes to measure the ion resonance using the quantum jump signal. Our approach to minimizethe drift rate and its sensitivity to temperature fluctuations has been to stabilize the cavity at the temperaturewhere its coefficient of thermal expansion is zero. We will present an overview of our recent progress made onthe frequency standard based on the laser-cooled and trapped single ion of 88 Sr + ." @default.
• W1618421884 created "2016-06-24" @default.
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• W1618421884 date "2007-09-13" @default.
• W1618421884 modified "2023-09-27" @default.
• W1618421884 title "High-resolution spectroscopy of the88Sr+single ion optical frequency standard" @default.
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• W1618421884 doi "https://doi.org/10.1117/12.734689" @default.
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