In-situ measurement of magnetic field gradient in a magnetic shield by a spin-exchange relaxation-free magnetometer*
Fang Jian-Chenga), Wang Taoa)†, Zhang Hongb), Li Yanga), Cai Hong-Weia)
       
Simulation of the electron polarization as a function of pump laser power, showing that the polarization of the potassium increases with the augmentation of the pump beam power, and the polarization is almost 1, when the pumping laser power is larger than 60 mW.