Relationship measurement between ac-Stark shift of 40Ca+ clock transition and laser polarization direction

Relationship measurement between ac-Stark shift of ⁴⁰Ca⁺ clock transition and laser polarization direction

Song Hong-Fang^{1, 2, 3, 4}, Chen Shao-Long^{1, 2, 3, 4}, Zeng Meng-Yan^{1, 2, 3, 4}, Huang Yao^{1, 2, 3}, Shao Hu^{1, 2, 3, 4}, Tang Yong-Bo⁵, Guan Hua^{1, 2, 3}, Gao Ke-Lin^{1, 2, 3, †}

(color online) Relationships between frequency shift and polarization angle of 395-nm light for different cases. Each point is averaged over 50 measurements. The red point gives the frequency shift of 4S_{1/2,m = −1/2} → 3D_{5/2,m = −1/2} transition and the blue one shows the frequency shift of 4S_{1/2,m = −1/2} → 3D_{5/2,m = + 1/2} transition. Both the red and the blue points go periodically and they have the opposite values at each angle. The black dot refers to averaged values of red and blue ones. Only statistics error is considered here, which is no more than 0.8 and cannot be drawn obviously.