Measurement and Suppression of Transverse Optical Pumping in a Spin-Exchange Relaxation-Free Co-Magnetometer

Wei, Yao; Zhai, Yueyang; Li, Renjie; Liu, Sixun; Fan, Wenfeng; Quan, Wei

doi:10.1109/tim.2022.3224540

Cited by 2 publications

(1 citation statement)

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“…However, when the degree of polarization (DOP) of the probe laser has been measured, a shift from complete linear polarization has been observed [16]. The optical power density and wavelength of the probe laser can be adjusted to suppress the probe laser pumping effect again [19,20]. However, all previous studies have only focused on methods to suppress the PLPE; studies on the changes in the main parameters (such as the compensation point B c ) under different suppressed levels are scarce.…”

Section: Introductionmentioning

confidence: 99%

The suppression of the probe laser pumping effect in SERF atomic magnetometer

et al. 2023

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Introduction: A spin exchange relaxation free atomic magnetometer, as an ultra-highly sensitive magnetic field sensor, is limited by the performance of the probe laser system. The probe laser pumping effect (PLPE) hinders the increase in the performance of probe laser system.Methods: This study investigated the PLPE and proposed a method for suppressing the same. Through changes to the angle of a quarter wave plate and the addition of a triangular modulated magnetic field to the alkali atoms, the suppression point was determined.Results and discussion: Further, related parameters were measured for different degree of polarizations of the probe laser, which confirmed that the influence of PLPE on the magnetic field was the least at the suppressed point.

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Section: Introductionmentioning

confidence: 99%

The suppression of the probe laser pumping effect in SERF atomic magnetometer

et al. 2023

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Real-time measurement of pump beam polarization through the transmitted light intensity in a polarized alkali metal vapor cell

Duan,

Ma,

et al. 2024

Opt. Express

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A laser beam with left-/right-handed circular polarization is generally used to create the oriented atomic spins for precision measurements in a spin-exchange relaxation-free (SERF) co-magnetometer. The fluctuation of laser polarization interferes with the spin polarization of alkali metal atoms, leading to the system performance degradation. Here, we report a method for real-time polarization state measurement by using the transmitted light intensity of the pump beam passing through the vapor cell. Based on the principle of circular dichroism, the optical absorption model of polarized alkali metal atoms is established. The simulation results of the transmittance of the pump laser with different polarization states through the alkali metal vapor cell are given and verified by experiments. The experimental results show that the circularly polarized beam has the weakest absorption, while the linearly polarized laser beam is absorbed the strongest. The achieved measurement accuracy stands at an impressive 98.83 %. This work provides a simple and easy-to-use way to measure the polarization state of the laser beam used in the vapor cell devices, particularly the microfabricated prototypes with limited space.

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Measurement and Suppression of Transverse Optical Pumping in a Spin-Exchange Relaxation-Free Co-Magnetometer

Cited by 2 publications

References 26 publications

The suppression of the probe laser pumping effect in SERF atomic magnetometer

The suppression of the probe laser pumping effect in SERF atomic magnetometer

Real-time measurement of pump beam polarization through the transmitted light intensity in a polarized alkali metal vapor cell

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