FID Magnetometer Based on Paraffin-Coated Planar Reflective Multipass Cells

• URL: http://arxiv.org/abs/2605.01460v1
• Date: Sat, 02 May 2026 14:19:56 GMT
• Title: FID Magnetometer Based on Paraffin-Coated Planar Reflective Multipass Cells
• Abstract summary: The cell has an internal volume of $12 times 12 times 8mathrmmm3$ and supports 20 optical passes with a total transmittance exceeding $65%$.<n>A single-cell free-induction-decay magnetometer reaches $10mathrmpT/sqrtmathrmHz$ in the geomagnetic-field range.
• Score: 4.627466005093037
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate a paraffin-coated planar reflective multipass vapor cell for compact optical atomic magnetometry. The cell has an internal volume of $12 \times 12 \times 8~\mathrm{mm}^3$ and supports 20 optical passes with a total transmittance exceeding $65\%$, while maintaining a longitudinal spin-relaxation time of $^{87}\mathrm{Rb}$ longer than $1~\mathrm{s}$. The planar geometry provides spatially separated input and output beams, enabling compact optical integration. A single-cell free-induction-decay (FID) magnetometer reaches $10~\mathrm{pT}/\sqrt{\mathrm{Hz}}$ in the geomagnetic-field range, presently limited by current-source noise in the field coils. A two-cell differential configuration achieves a sensitivity of $\sim 28~\mathrm{fT}/\sqrt{\mathrm{Hz}}$ over the $1$--$15~\mathrm{Hz}$ band for bias fields of $0.3$--$0.7~\mathrm{G}$. These results establish that paraffin-coated planar multipass cells offer high optical depth, long coherence times, and an integration-friendly platform for ultrasensitive magnetometry.

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