Simultaneous improvement of the sensitivity and resolution of CPT magnetometers based on phase delay and differential method

• DOI: 10.1364/ol.528628
• Publication Date: 2024-06-06T18:01:14Z
• Authors: Jiahao Yuan; Pengcheng Du; Feifan Yang; Wei Quan; Jin Li
• Keywords: Differential phase

We report a method to enhance the sensitivity of coherent population trapping (CPT) magnetometers using combination left-handed and right-handed circularly polarized light phase-delay detection differential scheme. The approach can achieve four third-fold enhancement CPT dispersion signal slope three-fold reduction in noises. proposed experimentally exhibits magnetic field resolution open-loop measurements, could 1 p T / H z at 10 Hz 0.4 50–100 closed-loop measurement, which is four-fold compared single-transmitted magnetometer.