High contrast dark resonances in a cold-atom clock probed with counterpropagating circularly polarized beams

X. Liu; V. I. Yudin; A. V. Taichenachev; J. Kitching; E. A. Donley

doi:10.1063/1.5001179

High contrast dark resonances in a cold-atom clock probed with counterpropagating circularly polarized beams

X. Liu, V. I. Yudin, A. V. Taichenachev, J. Kitching, E. A. Donley

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

A cold-atom coherent population trapping clock based on σ+-σ- interrogation realized by counter-propagating optical fields of opposite circular polarization is presented. The simultaneous use of σ+ and σ- polarizations prevents atoms from being trapped in the end magnetic sublevels, significantly enhancing the contrast over interrogation with a single circular polarization. Because the system is based on cold atoms and there is very little relaxation, nearly complete dark states are created, and coherent population trapping resonances with maximum contrast are observed. A frequency stability of 1.3×10-11/√τ is achieved, which averages down to 2×10-13 after a 40 000 s integration period.

Original language	English
Article number	224102
Number of pages	5
Journal	Applied Physics Letters
Volume	111
Issue number	22
DOIs	https://doi.org/10.1063/1.5001179
Publication status	Published - 27 Nov 2017

Keywords

POPULATION
STABILITY
LINE

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10.1063/1.5001179

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abstract = "A cold-atom coherent population trapping clock based on σ+-σ- interrogation realized by counter-propagating optical fields of opposite circular polarization is presented. The simultaneous use of σ+ and σ- polarizations prevents atoms from being trapped in the end magnetic sublevels, significantly enhancing the contrast over interrogation with a single circular polarization. Because the system is based on cold atoms and there is very little relaxation, nearly complete dark states are created, and coherent population trapping resonances with maximum contrast are observed. A frequency stability of 1.3×10-11/√τ is achieved, which averages down to 2×10-13 after a 40 000 s integration period.",

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AU - Yudin, V. I.

AU - Taichenachev, A. V.

AU - Kitching, J.

AU - Donley, E. A.

PY - 2017/11/27

Y1 - 2017/11/27

N2 - A cold-atom coherent population trapping clock based on σ+-σ- interrogation realized by counter-propagating optical fields of opposite circular polarization is presented. The simultaneous use of σ+ and σ- polarizations prevents atoms from being trapped in the end magnetic sublevels, significantly enhancing the contrast over interrogation with a single circular polarization. Because the system is based on cold atoms and there is very little relaxation, nearly complete dark states are created, and coherent population trapping resonances with maximum contrast are observed. A frequency stability of 1.3×10-11/√τ is achieved, which averages down to 2×10-13 after a 40 000 s integration period.

AB - A cold-atom coherent population trapping clock based on σ+-σ- interrogation realized by counter-propagating optical fields of opposite circular polarization is presented. The simultaneous use of σ+ and σ- polarizations prevents atoms from being trapped in the end magnetic sublevels, significantly enhancing the contrast over interrogation with a single circular polarization. Because the system is based on cold atoms and there is very little relaxation, nearly complete dark states are created, and coherent population trapping resonances with maximum contrast are observed. A frequency stability of 1.3×10-11/√τ is achieved, which averages down to 2×10-13 after a 40 000 s integration period.

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