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Your search keyword '"Han, Bangcheng"' showing total 13 results
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13 results on '"Han, Bangcheng"'

12. Optimized gas pressure of an Rb vapor cell in a single-beam SERF magnetometer.

Author

Wang Y, Jin G, Tang J, Zhou W, Han B, Zhou B, and Shi T

Abstract

We present a theoretical and experimental study of a single-beam spin-exchange relaxation-free magnetometer in 87 Rb vapor cells under different nitrogen gas pressures. The spin relaxation rate is a key component to limit the magnetic sensitivity, and the zero-field resonance method was used to measure the spin relaxation rates of different alkali metal cells. Simultaneously, in a single-beam spin-exchange-relaxation-free (SERF) magnetometer, we demonstrated that the fundamental magnetic field sensitivity was also limited by the pumping light intensity. Based on our theoretical analysis and experimental results, we determined the optimal pumping light intensity and optimal gas pressure. We experimentally demonstrated that the magnetic field sensitivity was 8.89 fT/Hz in the single-beam configuration, with an active measurement volume of 3 × 3 × 3~mm 3 .

Published
2022
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13. Broadening of magnetic linewidth by spin-exchange interaction in the K-Rb- 21 Ne comagnetometer.

Author

Wei K, Zhao T, Fang X, Xu Z, Zhai Y, Quan W, and Han B

Abstract

The elimination of relaxation resulting from spin-exchange (SE) interaction is crucial for ultrasensitive atomic comagnetometers. In this study, we demonstrate the SE relaxation is only partially suppressed and significantly broadens the magnetic linewidth in the K-Rb- 21 Ne comagnetometer. The SE relaxation arises from the compensation magnetic field when operating in the self-compensation regime. We propose a new method to measure the SE relaxation in the self-compensation regime where the alkali-metal and noble-gas spin ensembles are coupled. In the presence of SE relaxation, we find the optimal alkali-metal polarization for maximizing the sensitivity is shifted from the typical value. Under various conditions, we present a detailed study of the SE relaxation and the scale factor as a function of alkali-metal polarization, which are further verified by the theoretical models. The reduction of SE relaxation and improvement of scale factor by using 87 Rb atoms is also studied.

Published
2020
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