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- W3105776553 abstract "We demonstrate a portable all-optical intrinsic scalar magnetic gradiometer composed of miniaturized cesium vapor cells and vertical-cavity surface-emitting lasers (VCSELs). Two cells, with inner dimensions of 5 mm × 5 mm × 5 mm and separated by a baseline of 5 cm, are driven by one VCSEL, and the resulting Larmor precessions are probed by a second VCSEL through optical rotation. The off-resonant linearly polarized probe light interrogates two cells at the same time, and the output of the intrinsic gradiometer is proportional to the magnetic field gradient measured over the given baseline. This intrinsic gradiometer scheme has the advantage of avoiding added noise from combining two scalar magnetometers. We achieve a sensitivity better than 18 fT/cm/√Hz in the gradient measurement. Ultra-sensitive short-baseline magnetic gradiometers can potentially play an important role in many practical applications, such as nondestructive evaluation and unexploded ordnance detection. Another application of the gradiometer is for magnetocardiography (MCG) in an unshielded environment. Real-time MCG signals can be extracted from the raw gradiometer readings. The demonstrated gradiometer greatly simplifies the MCG setup and may lead to a ubiquitous MCG measurement in the future." @default.
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- W3105776553 date "2020-04-06" @default.
- W3105776553 modified "2023-09-30" @default.
- W3105776553 title "Portable intrinsic gradiometer for ultra-sensitive detection of magnetic gradient in unshielded environment" @default.
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- W3105776553 doi "https://doi.org/10.1063/5.0004746" @default.
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