Correlation between the magic wavelengths and the polarization direction of the linearly polarized laser in the Ca<sup>+</sup> optical clock<xref ref-type="fn" rid="cpb142700fn1">*</xref>

Correlation between the magic wavelengths and the polarization direction of the linearly polarized laser in the Ca⁺ optical clock*

Liu Pei-Liang^a),^b),^c), Huang Yao^a),^b), Bian Wu^a),^b),^c), Shao Hu^a),^b),^c), Qian Yuan^a),^b),^c), Guan Hua^a),^b), Tang Li-Yan^a),^b), Gao Ke-Lin^a),^b)†

Overview of the experimental setup. DL: diode laser; AOM: acousto-optic modulator; 1/2 λ : half wave plate; PD: photo diode; PBS: polarized beam splitter.