Laser-cooled neutral atom frequency standards

Details Laser-cooled neutral atom frequency standards Laser-cooled neutral atom frequency standards

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ieeep..79..943r&link_type=abstract

IEEE, Proceedings (ISSN 0018-9219), vol. 79, July 1991, p. 943-951. Research supported by U.S. Navy.

Physics

Optics

12

Atomic Clocks, Cooling, Frequency Standards, Laser Applications, Magneto-Optics, Neutral Atoms, Accuracy, Atomic Beams, Cesium, Hyperfine Structure, Signal To Noise Ratios

Scientific paper

The authors review the prospects for a frequency standard based on what is called the atomic fountain. Atomic fountain frequency standards have better signal-to-noise ratios than ion standards, but suffer from larger systematic effects. An analysis of a Cs microwave fountain predicts potential stability and accuracy improvements of a factor of 100 over present laboratory standards, with an ultimate accuracy near 10 exp -16. An optical frequency standard based on a two-photon transition in xenon is analyzed and shown to have potential stability 5 orders of magnitude better than current Cs standards, and a possible accuracy of 10 exp -18. Neutral atom frequency standards will have much better signal-to-noise ratios than ion standards, but suffer from larger systematic effects, making the two technologies complementary in many ways.

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