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Journal of Physics Conference Series

Compact microwave frequency standard on Hg-199 ions for navigation systems

Nikita A. Lukashev, Angelina V. Moroz, Vadim Vladimirovich Davydov

Published Jun 1, 2019• 28 citations
Publisher

Abstract

Abstract The design of a magnetic trap for low mass-dimensional microwave frequency standards is presented. The dependencies of the number of photons registered by PMT on magnetic field values are established. The new algorithm for optical processing has been developed. The comparison of experimental Allan deviation for different designs of microwave frequency standards on 199Hg+ ions has been performed.

DOI
10.1088/1742-6596/1236/1/012068

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We discuss frequency standards based on laser-cooled 199Hg+ ions confined in cryogenic rf traps. In one experiment, the frequency of a microwave source is served to the ions' ground-state hyperfine transition at 40.5 GHz. For seven ions and a Ramsey free precession time of 100 s, the fractional frequency stability is 3.3 (2) X 10-13 (tau) -1/2 for measurement times (tau) < 2 h. The ground-state hyperfine interval is measured to be 40 507 347 996.841 59 (14) (41) Hz, where the first number in parentheses is the uncertainty due to statistics and systematic errors, and the second is the uncertainty in the frequency of the time scale to which the standard is compared. In a second experiment under development, a strong-binding cryogenic trap will confine a single ion used for an optical frequency standard based on a narrow electric quadrupole transition at 282 nm. The bandwidth of the laser used to drive this transition is less than 10 Hz at 563 nm.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 15, 1998•1 citation
Abstract The design of a magnetic trap for low mass-dimensional microwave frequency standards is presented. The dependencies of the number of photons registered by PMT on magnetic field values are established. The new algorithm for optical processing has been developed. The comparison of experimental Allan deviation for different designs of microwave frequency standards on 199Hg+ ions has been performed.
Abstract The world around us depends on devices capable of producing or maintaining a signal with an extreme precision. Quantum frequency standards are the answer to this problem. This article presents a modified version of newly developed quantum frequency standard based on trapping Hg-199 ions by magnetic field. The new prototype was developed a while ago and now it was modified due to algorithm improvements and renewed digital hardware, analog and digital circuitry being reordered. Results for Allan deviation show 3 % improvement for long-term frequency stability and more than 5 % for short-term stability
We discuss frequency standards based on laser-cooled 199Hg+ ions confined in cryogenic rf traps. In one experiment, the frequency of a microwave source is served to the ions' ground-state hyperfine transition at 40.5 GHz. For seven ions and a Ramsey free precession time of 100 s, the fractional frequency stability is 3.3 (2) X 10-13 (tau) -1/2 for measurement times (tau) < 2 h. The ground-state hyperfine interval is measured to be 40 507 347 996.841 59 (14) (41) Hz, where the first number in parentheses is the uncertainty due to statistics and systematic errors, and the second is the uncertainty in the frequency of the time scale to which the standard is compared. In a second experiment under development, a strong-binding cryogenic trap will confine a single ion used for an optical frequency standard based on a narrow electric quadrupole transition at 282 nm. The bandwidth of the laser used to drive this transition is less than 10 Hz at 563 nm.