Influence of pump intensity on atomic spin relaxation in a vapor cell<xref rid="cpb_28_11_117601fn1" ref-type="fn">*</xref><fn id="cpb_28_11_117601fn1"><label>*</label><p>supported by the National Key R&D Program of China (Grant No. 2017YFA0304502) and the National Natural Science Foundation of China (Grant Nos. 11634008, 11674203, 11574187, and 61227902).</p></fn>

Influence of pump intensity on atomic spin relaxation in a vapor cell**

supported by the National Key R&D Program of China (Grant No. 2017YFA0304502) and the National Natural Science Foundation of China (Grant Nos. 11634008, 11674203, 11574187, and 61227902).

Yang Chen^{1, 2}, Zuo Guan-Hua^{1, 2}, Tian Zhuang-Zhuang^{1, 2}, Zhang Yu-Chi^{3, †}, Zhang Tian-Cai^{1, 2, ‡}

Experimental setup for measuring the MRL. BS: beam splitter; PSL: the laser frequency control system by polarization spectrum locking technique; SAS, saturated absorption spectrum; HWP, half-wave plate; PBS, polarization beam splitter; HR, highly reflective mirror; GTP, Glan–Taylor prism; WP, Wollaston prism; BPD, balanced photodetector; AC, alternating current power supply; OSC, oscilloscope. The involved energy levels of cesium atom are shown in the upper right. m_F and m ′ F denote the magnetic quantum numbers of the ground and excited states, respectively. The Z polarized pump beam and the Y polarized probe beam are resonance to cesium D₁ line 6²S_1/2 F = 4 to 6² P_1/2 F′ = 3 and D₂ line 6² S_1/2 F = 4 to 6² P_3/2 F′ = 5, respectively. The magnetic field (along the X direction) can be changed near the zero point by sweeping the driving current of the Helmholtz coil via AC, and the MRL can be obtained via OSC.