Improving probe-beam stability in spherical-cell atomic magnetometers using 4f spatial filtering.

Authors

XueJing Liu, ZhenXiang Tang, Yang Li

Published in

Applied optics. Volume 65. Issue 32. Pages 11447-11456. Nov 10, 2026. Epub Oct 14, 2026.

Abstract

Spherical vapor cells introduce position-dependent refraction and variations in the incident-angle distribution that can destabilize the probe-beam polarization readout in atomic magnetometers. We propose a pre-positioned, 4f spatial-filtering system to suppress high-angle components of the probe beam and improve its stability against relative position disturbances between the beam and the vapor cell. A Jones-matrix model is developed to describe the effect of incident-angle variations on polarization, and experiments are performed to evaluate the extinction ratio and signal-to-noise ratio (SNR). With 4f filtering, the extinction-ratio variation is reduced by 15.67%-65.39%, while the SNR variation decreases by 19.21%-74.54% under vapor-cell position perturbations. Zemax simulations further confirm improved received-intensity stability.

PMID:
43008171
Bibliographic data and abstract were imported from PubMed on 11 Nov 2026.

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