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Spin-exchange narrowing of the atomic ground-state resonances.

Chalupczak, W; Josephs-Franks, P W; Patton, B*; Pustelny, S* (2014) Spin-exchange narrowing of the atomic ground-state resonances. Phys. Rev. A, 90 (4). 042509

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We have measured the magnetic-resonance linewidth of Zeeman coherences in a caesium vapour as a function of magnetic field from zero to 200 µT. In the regime where the spin-exchange rate is larger than the nonlinear Zeeman splitting of the alkali atoms, rapid spin exchange causes narrowing of the individual resonances and a suppression of the splitting. This behaviour is reflected in density-matrix simulations and is analogous to the suppression of spin-exchange broadening between hyperfine manifolds at low field and high alkali density. We also demonstrate similar narrowing when the nonlinear Zeeman splitting is suppressed with a tensor light shift due to a linearly polarized off-resonant beam. These results suggest methods for reducing the spin-exchange-limited linewidth of quantum sensors (e.g., alkali-vapour magnetometers) at higher magnetic fields.

Item Type: Article
Subjects: Time and Frequency
Time and Frequency > Optical Frequency Standards and Metrology
Identification number/DOI: 10.1103/PhysRevA.90.042509
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6395

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