Influence of double-pump light on sensitivity of all optical Cs atomic magnetometer

Atomic polarizability can influence the sensitivity of atomic magnetometer. As the buffer gas of Cs vapor cell was about 13 332.2 Pa, the two pump light frequencies were locked toF=4F=3 and F=3F=4 of Cs D1 transition respectively, the population dynamics of the magnetic sublevels of ground states and excited states were calculated. We find that with the sustained action of pump light ,the population of F=3 and F=4 are pumping to |F=4,mF=4, and the polarizability reaches maximum value. At the same time the signal-noise ratio of experimental result increases effectively by using two pump beams, then the sensitivity of atomic magnetometer increases by 34%.