## Abstract

Transitions between the extreme angular-momentum states of alkali D lines hold the potential for enabling accurate high-field optical magnetometry because of their very simple magnetic field dependence described only by a linear and a quadratic term, characterized by the two coefficients *γ1 *and *γ2*. Here, we present very accurate measurements of these coefficients, for the cesium D_{2} line, thereby overcoming a major obstacle for the realization of this future technology. By means of saturated absorption spectroscopy on a cesium gas, in 3 T and 7 T magnetic fields, we measure the linear magnetic frequency shift of the transition to be *γ*_{1}=13.994 301(11) GHz/T. This measurement corresponds to an optical magnetic field determination of better than 1 ppm accuracy. From this value, we can calculate the fine-structure Landé g-factor *gJ*(6^{2}P_{3/2})=1.334 087 49(52). This result is consistent with the previous best measurement, and it improves the accuracy by more than 2 orders of magnitude. We also measure, for the first time, the quadratic diamagnetic shift as *γ*_{2}=0.4644(35) MHz/T^{2}. Our work opens up the field of accurate high-field optical magnetometry using atomic cesium, with possible applications in, e.g., medical MRI, fusion reactors, and particle accelerators. These high-accuracy measurements also allow for testing of advanced atomic structure models, as our results are incompatible with the Russel-Saunders coupling value and the hydrogen-constant-core-model value by 31 and 7 standard deviations, respectively.

Original language | English |
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Article number | 021036 |

Journal | Physical Review X |

Volume | 13 |

Issue number | 2 |

Number of pages | 20 |

ISSN | 2160-3308 |

DOIs | |

Publication status | Published - 2023 |

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