A dual-axis, high-sensitivity atomic magnetometer<xref rid="cpb_26_12_120702_fn1" ref-type="fn">*</xref> <fn id="cpb_26_12_120702_fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 61227902, 61673041, and 61374210), the National Key R & D Program of China (Grant No. 2016YFB0501601), and the Academic Excellence Foundation of Beihang University (BUAA) for PhD Students.</p> </fn>

A dual-axis, high-sensitivity atomic magnetometer* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 61227902, 61673041, and 61374210), the National Key R & D Program of China (Grant No. 2016YFB0501601), and the Academic Excellence Foundation of Beihang University (BUAA) for PhD Students.

Li Rujie^†, Quan Wei^‡, Fan Wenfeng, Xing Li, Wang Zhuo, Zhai Yueyang, Fang Jiancheng

(color online) The optical layout of the dual-axis SERF AM. FI: Faraday isolator, NE: noise eater, BSL: beam shaping lenses, HWP: half waveplate, PBS: polarizing beam splitter, PD: silicon photodiode, BS: beam splitter, PEM: photoelastic modulator, LP: linear polarizer, QWP: quarter waveplate, M: reflection mirror, WPP: wedge prism pairs. The pump beam is circularly polarized in order to polarize the atoms. The probe beam splits into two branches by the BS and the laser intensity of each branch is about 2.1 mW/cm². As the optical layout of Ch2 probe beam is the same as Ch1 except the orthogonal propagation direction shown in the top inset, the subsequent components after BS in Ch2 have been dropped. Three laser beams (one pump beam and two probe beams) meet at the cell center, and they are perpendicular to each other. The relaxation rates due to the two off-resonant probe beams are negligible compared to the pumping effect arising from the resonant pump laser.