Affiliation:
1. Shanghai Jiao Tong University
2. East China Normal University
3. Shanghai Research Center for Quantum Sciences
4. Shanxi University
Abstract
We demonstrate an atomic magnetometry using amplitude-modulated pumping and hyperfine repumping techniques in a paraffin-coated cell. By exploiting the constructive interference between spins polarized by the pump beam and an additional repump beam, we observe a three-fold increase in the amplitude of magnetic resonance, along with a reduction in linewidth by approximately two times. The implementation of the repump beam effectively narrows the linewidth, demonstrating successful suppression of spin-exchange relaxation. This reduction in relaxation rate, combined with the enhanced signal, significantly improves the sensitivity of the magnetometer. Consequently, our technique offers a promising approach for achieving SERF-like magnetometry with sub-fT-level sensitivity in Earth-field range and room-temperature environment.
Funder
Innovation Program for Quantum Science and Technology
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
the Shanghai Municipal Science and Technology Major Project
Shanghai Municipal Education Commission
National Key Research and Development Program of China
China Postdoctoral Science Foundation
Subject
Atomic and Molecular Physics, and Optics