A large sample study of spin relaxation and magnetometric sensitivity of paraffin-coated Cs vapor cells |
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Authors: | N Castagna G Bison G Di Domenico A Hofer P Knowles C Macchione H Saudan and A Weis |
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Institution: | (1) Université de Fribourg, Chemin du Museé 3, 1700 Fribourg, Switzerland;(2) Klinik für Neurologie, Universit?tsklinikums Jena, Erlanger Allee 101, 07747 Jena, Germany;(3) Laboratoire Temps-Fréquence, Université de Neuchatel, Neuchatel, Switzerland |
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Abstract: | We have manufactured more than 250 nominally identical paraffin-coated Cs vapor cells (28 mm inner diameter bulbs) for multi-channel
atomic magnetometer applications. We describe our dedicated cell characterization apparatus. For each cell we have determined
the intrinsic longitudinal, Γ
01, and transverse, Γ
02, relaxation rates. Our best cell shows Γ
01/2π≈0.5 Hz, and Γ
02/2π≈2 Hz. We find a strong correlation of both relaxation rates which we explain in terms of reservoir and spin exchange relaxation.
For each cell we have determined the optimal combination of rf and laser powers which yield the highest sensitivity to magnetic
field changes. Out of all produced cells, 90% are found to have magnetometric sensitivities in the range of 9 to 30 fT
. Noise analysis shows that the magnetometers operated with such cells have a sensitivity close to the fundamental photon
shot noise limit. |
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Keywords: | PACS" target="_blank">PACS 07 55 Ge 32 30 Rj 32 60+i 32 80 Xx |
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