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) Relevant energy levels and transitions of ⁴⁰Ca⁺. Because of the Zeeman effect, all levels split into several Zeeman sub-levels. The 397-nm laser is the cooling laser. The 866-nm laser is used for repumping the ion scattered into 3D_3/2 state back to 4P_1/2 for continuous cooling. The 854-nm light is used for quenching ion in 3D_5/2 state to ground state. The 729-nm transition is the optical clock transition and with magnetic field applied, the clock transition splits into ten Zeeman components.