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High spatial resolution multi-channel optically pumped atomic magnetometer based on a spatial light modulator
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DOI：10.1364/OE.398540.png)
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Ultra-sensitive multi-channel optically pumped atomic magnetometers based on the spin-exchange relaxation-free (SERF) effect are powerful tools for applications in the field of magnetic imaging. To simultaneously achieve ultra-high spatial resolution and ultra-high magnetic field sensitivity, we proposed a high-resolution multi-channel SERF atomic magnetometer for two-dimensional magnetic field measurements based on a digital micro-mirror device (DMD) as the spatial light modulator for a single vapor cell. Under the optimal experimental conditions obtained via spatial and temporal modulation of the probe light, we first demonstrated that the average sensitivity of the proposed 25-channel magnetometer was approximately 25fT/Hz(1/2) with a spatial resolution of 216 mu m. Then, we measured the magnetic field distribution generated by a gradient coil and compared the experimentally obtained distributions with those calculated via finite element simulation. The obtained g value of 99.2% indicated good agreement between our experimental results and the theoretical calculations, thereby confirming that our proposed multi-channel SERF magnetometer was effective at measuring magnetic field distributions with an ultra-high spatial resolution. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keyword:
MAGNETOENCEPHALOGRAPHY
RELAXATION
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
机构
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