A new planar multipass vapor cell achieves long coherence and high optical depth, enabling compact FID magnetometers with 28 fT/√Hz differential sensitivity.
For a single- channel optical powerP, the shot-noise-limited power fluctuation within bandwidth BW is δP= √ 2P ϵBW,(A8) whereϵ=hνis the photon energy
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2026 1verdicts
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FID Magnetometer Based on Paraffin-Coated Planar Reflective Multipass Cells
A new planar multipass vapor cell achieves long coherence and high optical depth, enabling compact FID magnetometers with 28 fT/√Hz differential sensitivity.