High-resolution spectroscopy of the 88Sr+ single ion optical frequency standard

Pierre Dubé; Alan A. Madej; John E. Bernard; Andrew D. Shiner

doi:10.1117/12.734689

12 September 2007 High-resolution spectroscopy of the ⁸⁸Sr⁺ single ion optical frequency standard

Pierre Dubé, Alan A. Madej, John E. Bernard, Andrew D. Shiner

Proceedings Volume 6673, Time and Frequency Metrology; 667305 (2007) https://doi.org/10.1117/12.734689
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

The present decade has seen great advances in optical frequency standards following the development of femtosecond laser 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 5s ²S_1/2-4d ²D_5/2 (S-D) transition frequency of the ⁸⁸Sr⁺ ion as a function of the quantization axis in the trap. This study revealed the presence of systematic shifts caused by residual micromotion in our rf Paul trap and led to an evaluation of those shifts. Also, a method was developed based on the measurement of the Zeeman spectrum of the clock transition to cancel the electric quadrupole shift caused by patch potentials on the trap electrodes. From these results, we also determined the absolute frequency of the S-D clock transition frequency at 674 nm with a fractional frequency uncertainty of 3.4 × 10^-14. We have since made improvements to our probe laser system and have observed 5 Hz Fourier transform limited linewidths on a Zeeman component of the S-D transition of the ⁸⁸Sr⁺ ion. To observe such a narrow transition it is essential to have a known and well behaved drift of the laser frequency during the few minutes it takes to measure the ion resonance using the quantum jump signal. Our approach to minimize the drift rate and its sensitivity to temperature fluctuations has been to stabilize the cavity at the temperature where its coefficient of thermal expansion is zero. We will present an overview of our recent progress made on the frequency standard based on the laser-cooled and trapped single ion of ⁸⁸Sr⁺.

Citation Download Citation

Pierre Dubé, Alan A. Madej, John E. Bernard, and Andrew D. Shiner "High-resolution spectroscopy of the ⁸⁸Sr⁺ single ion optical frequency standard", Proc. SPIE 6673, Time and Frequency Metrology, 667305 (12 September 2007); https://doi.org/10.1117/12.734689

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