(a) Experimental setup. Raman lasers 1–4 and an optical pumping laser are applied to implement the Raman sideband cooling. Dipole lasers 1 and 2 are applied to construct the crossed dipole trap. Bias coils are used to produce the external magnetic field. The probe laser passes through the trapped atoms, and the number and density of atoms are measured using the absorption image technique. (b) Experimental sequence for manipulation of the magnetic field, PA laser, and probe laser of absorption image.